The Prevalence Of Mental Health - 976 Words

The physical and mental health of homeless individuals is considerably worse than that of the general population. The prevalence of mental health disorder is astronomically higher among the homeless population. The use of alcohol abuse is usually associated with one or two other psychological disorders. There are many people who have outside issues as well such as physical abuse, antisocial, and sexual abuse. Their motivation to get out of being homeless is usually poor because of poor motivation, no support system, and depression. Substance abuse can be attributed to about fifty percent of the homeless population. Homeless individuals are three times more likely to have alcohol-use disorder compared with the general population (Keane, Magee, and Lee 2015). Alcohol is also usually associated with anxiety and depression disorders and it can lead to criminal behaviors or even suicide. Alcohol use can a contributor or the result of being homeless, many people use alcohol as a form of co ping. People who have experienced child abuse are more likely to develop a substance abuse disorder at a later age. It shows that the homeless population have experienced abuse or other traumatic incident in their life. The more likely someone is to recall a traumatic childhood experience the more likely they were to consume alcohol. Alcohol and abuse are very much related. So is low economic burden being of low wage household increases all these factors. The person will be more at risk toShow MoreRelatedPrevalence Of Mental Health Illnesses Essay1585 Words   |  7 PagesPrevalence of Mental Health Illnesses in Inmates In this country, individuals with a mental health illness make up half of all correctional facility intakes, which is rivaled with eleven percent of the overall populace, however, only 1 in 9 incarcerated individuals are given any care for their mental illness (Anasseril, 2007). When the much-needed care is absent in prisons and jails, inmates with mental health disorders experience excruciating signs and their disorder can decline and be plaguedRead MoreThe Prevalence Of Mental Health Disorders1335 Words   |  6 PagesThe prevalence of mental health disorders in the Unites States is growing exponentially. According to the Center for Disease Control (2015), one out of five adolescents are diagnosed with a mental health disorder and 15 million children are estimated with a mental health diagnosis. Having resources available to this population from the advanced schools of psychology is vital to maintaining healthy interventions for our future children and adolescents. Furthe rmore, it’s imperative to review notRead MorePrevalence Of Mental Health Effects On An Individual s Emotions, Perceptions, Behavior, And Wellbeing1829 Words   |  8 Pages 1. Prevalence of Mental Health: Mental health illnesses impact on an individual’s emotions, perceptions, behaviour and wellbeing. Prevalence refers to how common the condition is (all diagnosed cases), and as such morbidity rates are often reliable indicators for the prevalence of a particular condition. In 2011-12 there were 3 million Australians who had reported having a mental health condition (ABS 2012). This is evident of an increasing trend in the last decade, which could be reflective ofRead MoreHealth System Differences : Louisiana And Illinois823 Words   |  4 PagesHEALTH SYSTEM DIFFERENCES: LOUISIANA AND ILLINOIS The Health system in Louisiana and Illinois is widely different on basis of access to healthcare, mental health issues and many others. Looking at overall performance of healthcare system by measuring 42 different variables such as at systemic level, from insurance coverage to vaccination rates to avoidable hospital stays and at individual level, from rate of obesity to numbers of adults who have lost six or more teeth, Illinois is among the thirdRead MoreDescriptive Epidemiology Of Major Depressive Disorder In Canada1111 Words   |  5 Pagesused a survey called Canadian Community Health Study - Mental Health (CCHS-MH) to evaluate Major Depressive Disorder among their participants. 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The results of these surveys conclude that mental health disorders are more prevalent than any other chronicRead MoreSymptoms And Factors Of Schizophrenia1344 Words   |  6 Pages1.0 Introduction This assignment will provide a definition about schizophrenia, its symptoms and factors that may cause it briefly as well as its incidence and prevalence in Australia, Spain and United States of America. It also introduces some of old and recent treatments of this disease. 2.0 Definition of Schizophrenia Schizophrenia is categorised as a psychotic disorder. Psychosis-a general word that is usually used as the psychotic illnesses syndromes-affects people’s thoughts, speech and senseRead MoreSymptoms And Treatment Of Depression820 Words   |  4 Pagesfor Disease Control and Prevention [CDC], 2015; Mental Health Association, 2016). Depression is among the leading causes of disability in the general adult population, ages 18 years and above (US Preventative Services Taskforce [USPST], 2016). The US Preventative Services Taskforce recommends that all adult patients be screened for depression (USPST, 2016). Approximately 6% of older adults, ages 65 and older, have some form of depression (Mental Health Association, 2016). The risk of depression doublesRead MoreThe Prevalence Of Mental Illness1348 Words   |  6 PagesMental illness is increasingly being recognized as a challenge faced by many Canadians. The Mental Health Strategy for Canada estimates that ‘in any given year , one in five people in Canada experiences a mental health problem or illness’. (Bartram et al., 2012) The prevalence of mental illness is not exclusive to the Canadian population and it is estimated that these figures are rising. In 2004, the World Health Organization ranked major depression as third in terms of the overall burden of diseasesRead MoreDistribution of Depression Amongst Young Australians Essay1547 Words   |  7 PagesIntroduction Depression is a mental disorder in which a patient might feel intense, prolonged, negative emotions (Beyond Blue, 2014). This can have severe impact on a persons mental and physical health, thus affecting a persons quality of life. Severe cases can even lead to suicide. It is estimated that one in six Australians will experience depression in their lifetime (Beyond Blue, 2014). The burden of disease gives an indication of of the loss of health and well being of Australians due to

The Truth About The Boy - 1365 Words

He knew his wife was up to something the moment she tried to ignore anything to do with the mere mention of the word boyfriend. How she adamantly refuse to say Joshua Hunt’s name was yet another hint I should’ve paid closer attention. maybe it was how I was on the verge of asking her if she knew any other name then Trever Benson that had caused me to be distracted. She knew the moment that boy was introduced to me and his attention was more of some of the maids preforming their task then speaking to me. when one of the women dropped something they had to pick up and he broke out in a cold sweat, I should’ve thrown him out of the nearest window. It wouldn’t have mattered if I had, we were on the ground floor. Then and again, it might not have been a total loss if the shock of it all cause him to scream for several hours thinking he was falling. He didn’t seem too bright to know the difference. For some reason the boy believes my wife is the only appr oval he needs to have a relationship with my daughter. Then and again I should have asked my wife what kind of relationship he was hoping to have with my daughter. Well, the boy looked a bit soft to me and giggles constantly. Actually, I wouldn’t have been surprised to find out that the boy liked other boys and was hoping my daughter might help him find the perfect boyfriend. I didn’t know much about the Benson family, other than they were distant cousins to some man Elena was once in a relationship with. I knewShow MoreRelatedThe Truth About Boys And Girls850 Words   |  4 Pagesforced into sex trafficking? There are limitations on our freedom. Both speaker Chris Baker, and the article The Truth about Boys and Girls demonstrate how society’s influence puts limitations on people’s freedom. Stereotypes and generalizations about boys and girls is an example of how people have freedom with limitations. The Truth about Boys and Girls brings up the point of â€Å"are boys really more aggressive and girls really more empathetic- or do we just see what we expect in them?† (Eliot) ThisRead More Being Covered from the Truth in Araby by James Joyce Essay1097 Words   |  5 Pagesthe Truth in Araby by James Joyce â€Å"Araby† by James Joyce, is a short story about a young boy trying to find and his search for inner happiness. The main setting takes place in the boy’s neighborhood where he lives with his aunt and uncle. The sub setting takes place in an Araby or English bazaar, a carnival if you will. In the neighborhood we find that there is; an uninhabited house that has not been occupied for some time, a girl, who’s referred to as ‘Mangan’s sister’, whom the boy hasRead MorePrejudice, Prejudice And Prejudice1190 Words   |  5 PagesThe truth is often hindered by people’s bias and prejudice views. 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Louis Tomlinson’s auditioning song forRead MoreColumbine, By Dave Cullen914 Words   |  4 Pagesunfolded on April 20th, 1999. That day, two boys, self-proclaimed rebels, armed themselves and proceeded to murder the same students they had walked the halls with for four years. As the stories of Dylan, Eric, and the victims of this tragic day came to light, many falsehoods also arose. Unfortunately, the myths and truths about Columbine still linger with us today. Eric Harris and Dylan Klebold left a lasting impression on the world; but left behind the truth as to why they really did it. This leavesRead MoreThe Text Of The Meno By Plato938 Words   |  4 Pagesparadox explained can be used to discuss merely anything, and we can thus say that either one knows or does not know. If a person knows, then they cannot investigate or question their knowledge. However, if a person does not know, they cannot inquire about it which means a person cannot question for not knowing what they do not know. Plato goes ahead and resolves the paradox in the Meno by saying that, â€Å"one would not seek what he knows, for since he knows it there is no need of the inquiry, nor whatRead MoreThe Theme Of Courage In Black Boy By Richard Wright757 Words   |  4 PagesThe Jim Crow Era was a time of intense slavery and discrimination against the black population. One boy who was part of that population was Richard Wright, a young boy who dreamed of becoming a writer. His desire was to write in order to expose his rough childhood and the truths of what happened during this time period. Another writer who wrote about the truths during an intense time period, was Richard Faulkner, who wrote during the Red Scare which was when America was living in fear of possibleRead MoreWhat Do You Do When You re Not Sure1311 Words   |  6 PagesNicholas Catholic church in the Bronx in the year following President Kennedy’s assassination. His sermon builds upon a story of a sailor lost at sea who has doubts about the course he has set and his doubt becomes the metaphor for the community who has lost its certainty. So, in other words, when someone loses certainty they doubt about someone or something and want to belief the uncertain is true. To do so they make anything in their power to find out that their doubt is a belief even if it meansRead MorePlato s Allegory, And Glaucon, The Second Speaker1345 Words   |  6 Pagesobjects held by the passers-by, along the road, belong to the shadows. â€Å"And so in every way they would believe that the shadows of the objects we mentioned were the whole truth.† (Plato, 26). Because these prisoners have relied so much on their senses to make judgements, they have developed a tendency to make false judgments about the things happening around them. Plato believes that the world as seen using our senses has more fake to it than real. As humans, each individual is limited by their ownRead MoreWaiting For The Barbarians By. Coetzee1298 Words   |  6 Pageslike a Mantra. To Colonel Joll, the Mantra for his cruel method is, â€Å"Pain is Truth: all else is subject to doubt† (Coetzee p.6). Because of this philosophy, the first victim suffers a fatal fate in the hands of Colonel Joll’s brutality. Two prisoners, a boy and his uncle, were arrested shortly after a raid incident had concluded that these two were not part of. According to the uncle, the boy is sick, and he was taking the boy to find a doctor. Sadly, even the best doctor cannot help the man as the Magistrate

Why We Dont Need a Military Draft free essay sample

With long, drawn-out wars in Iraq and Afghanistan, regularly scheduled deployments to other areas of the world, and tensions between the U. S. and Iran threatening to ignite another war, our military is spread too thin. For our military to complete its mission of defending our country effectively, it is obvious that more personnel are needed. One way to ensure the military is not under-manned would be to reinstitute the draft. Reinstituting the draft would ensure the military an unlimited supply of new recruits. However, there are other, better, and more cost-effective ways to ensure that our military is properly manned without resorting to a draft. There are plenty of logical, valid arguments to support not reinstituting a military draft. A draft would be a huge waist of tax payers’ money. Just getting draftees to recruiting stations to go through the process of physical and mental examinations is not an inexpensive process. There would also be an issue with draft dodgers, which there would be plenty of in this day and age. The process of finding these people, prosecuting them and eventually incarcerating them would be another unnecessary cost to society. There would also be many people who would claim conscientious objector status. Infield (2005) states that even though the draft has not been reinstituted, pacifist churches are beginning to prepare it’s male members on how to become conscientious objectors, for fear a draft is imminent. And as if there would not be more than enough people trying to get out of military service on their own, authorities at the Selective Service System, of all places, are advising the leaders of these churches how to prepare their member’s on how to successfully apply for conscientious objector status (Peace Churches Plan Alternative to Military Draft). Another argument against the draft is that Americans simply do not want to see the draft’s return. Though it has not always been the case, a majority of Americans today are against reinstituting the draft. According to Jones (2007), most Americans were in favor of reinstituting the draft in 1980, when President Jimmy Carter discussed the possibility of the draft’s return during the Cold War. However, the majority of Americans had become against the idea of the draft returning after Ronald Reagan took office in 1981. The below line graph illustrates the results of Gallup Polls conducted at various time beginning in 1980 and ending in 2007. â€Å"Yes† represents people who voted in favor of reinstituting a military draft and â€Å"No† for those gainst it. The last poll taken in August 2007 show an overwhelming majority of Americans are against reinstituting the draft. Pro-draft proponents may argue the reasons the anti-draft numbers are so high is only because of the current wars in Iraq and Afghanistan. However, the poll shows that the current feeling toward the draft has been around since 1998, well before the events that led to the U. S. going to war (Vast Majority of Americans Opposed to Reinstituting Military Draft). There are also arguments against the draft that are not very logical, and border on insane. The absurdity of some these arguments serve to only hurt the logical and valid arguments of the anti-draft movement. For example Gregory (2005) writes that the most important argument for not reinstituting the draft is that the draft is a form of slavery (The Most Important Argument Against the Draft). While it is true that many people would be forced to do a job that they do not wish to do, serving in the military is not slavery. It is the price of living in a free society. If a draft were to be reinstituted, many of those called upon to serve would make more money than they ever could in the civilian sector, and they would have medical and dental benefits, for themselves and for their dependents, that no civilian employer could ever provide. The pay and benefits that today’s U. S. military personnel are so attractive that many of those drafted would probably end up making the military a career. While there are many arguments against reinstituting the draft, there are also many arguments that support the draft, though many, if not most are not practical or logical. Noel Koch (2004), former Secretary of Defense and speech writer for President Nixon, argues that more men and women are needed on active duty in order to fight wars, which is his only logical argument for returning the draft. His other arguments however are not logical. Koch states that members of his family have served in every conflict since the Civil War because service was expected. He also points out that people who would otherwise not have an opportunity to attend college would be able to benefit from the GI Bill by serving in the military. Finally, he argues that because of the draft during the Vietnam Era, people from different classes, races and religious backgrounds that were forced to live and work together learned to get along with one another (Why We Need the Draft Back). While these arguments by Mr. Koch may be true, they are not valid reasons for reinstituting the draft. Just because other members of one’s family served in the military, this argument sounds like he is in favor of a draft solely to ensure every male member of every family serve in the armed forces during a war. Not everyone is cut out for military service; just because some member’s of a family have served does not mean every member should serve just to follow a â€Å"tradition†. They should â€Å"want† to serve. And while the GI Bill does help those who serve in the military pay for college, there are other and much easier ways to finance a college education, even for those that come from less privileged backgrounds. Lastly, while a draft would throw a mix of people from different backgrounds together, and the majority of them would probably get along well, this argument makes it sound like he supports the draft to conduct a social experiment. Forcing people to serve in the military through a draft would do more harm to the military than good. Serving in the military is not like any other job. It is not easy during peacetime, much less during a war. Military service is very stressful for the military member and for his or her family members as well. To have an effective military, people serving in military have to want to serve and have to have the support of their immediate family, especially while fighting a war on many fronts. People who are forced to serve, particularly those that do not wish to, will be a liability to any combat unit, and those units that do not see action as well. In today’s all volunteer military, minimal service obligations are in place for a reason; today’s soldiers, sailors, and airmen spend years training to become proficient in their jobs. Draftees would serve only 18-24 months of service. They would lag behind in training compared to the volunteer force. By the time they became proficient in their duties, their service obligation, in most instances, would be over. There are standards for people to join and be accepted in the volunteer force: personnel must pass an entrance aptitude exam; personnel who have displayed certain criminal behavior in the past are not allowed to join the military; and people who have chronic injuries or illnesses are not allowed to join. By reinstituting the draft, entrance exam standards would have to be lowered or the exam done away with entirely to prevent draftees from intentionally failing to avoid service. Additionally, anyone who truly did not wish to serve could fake injury or mental illness to get out of service. Expanding today’s volunteer military by allowing more people to join would be the smartest and most economical way to ensure enough people are on active duty. Expanding the size of the volunteer force and allowing the brightest, most patriotic and capable people who want to serve to enlist or apply for officer programs would be the best way to ensure that we have a capable military. Today’s all volunteer military is made up of the most educated personnel, both officer and enlisted, this country, indeed the entire world, has ever seen. Reinstituting the draft would result in a â€Å"dumbing down† of today’s military (Fick, 2004). In summary, reinstituting the draft is not necessary to maintain a ready and effective military: The draft would result in lower standards for draftees. These draftees would not be as well trained as volunteers. The draft would cause greater costs than simply allowing more people who would like to volunteer to join. The best way to ensure our military’s effectiveness and readiness would be to expand the volunteer force to ensure the brightest, most patriotic, and most capable people are recruited, trained and retained for long-term military service instead of forcing people into service that do not wish to do so. There are plenty of people who would like to serve voluntarily. However, current limits on the size of the military prevent them from doing so.

Periodic Table Research Task Essay Example

Periodic Table Research Task Essay Periodic Table Research Task By Kevin Shaji Part A. You are to research the task below and submit as a written piece of work i) John Dalton proposed his atomic theory in 1808. Outline his theory. (4 marks) ii) Explain which part of Dalton’s atomic theory was later found to be incorrect. (3 marks) iii) Dalton developed a way to measure the relative atomic mass of the different elements. Using examples research and describe the meaning of the term ‘relative atomic mass’. (3 marks) i) 1) Elements are made up of tiny particles called atoms. 2) Atoms cannot be destroyed or created but can be rearranged during chemical changes. ) Atoms of a particular element are identical in mass, size, shape and other properties. 4) Atoms of different elements are different in their mass, size, shape and other properties. 5) Atoms cannot be divided into smaller particles. 6) Atoms of different elements combine in small whole-number ratios to form compounds. ii) 1) One part of Daltonâ €™s atomic theory that was later discovered to be incorrect was the part where atoms could not be divided into smaller pieces. New research has proved that atoms can be sub-divided into sub-atomic particles like protons, neutrons and electrons. ) Due to the discovery of isotopes it has been discovered that atoms of the same element are not exactly identical. They have different masses due to the number of neutrons. 3) Also it has been discovered that different elements have the same mass. These elements are called isobars. 4) It has been recently discovered that atoms can actually be destroyed by fission processes in atomic reactors or by atomic bombs. 5) Another defect in Dalton’s atomic theory is that not all compounds have small whole-number ratios. They can actually have large whole-number ratios as well. ii) The relative atomic mass is defined as: â€Å"the average mass of the isotopes in a naturally occurring sample of the element, taking into account the proportio n of each isotope present. † The symbol for relative atomic mass is Ar. For example naturally occurring chlorine has two isotopes Cl-35 and Cl-37. Cl-35 has a relative abundance (which is the percentage of that isotope on Earth in relation to the total abundance of the atom on Earth) of 75% while Cl-37 has a relative abundance of 25%. To calculate the Ar you must put the above into a formula. Ar= (75/100? 35) + (25/100? 37) =35. Another example of calculating relative atomic mass is: For an element E with the naturally occurring isotopes aE, bE, cE, and with the respective abundances of A%, B%, C% etc, the relative atomic mass (Ar) = (A/100 x a) + (B/100 x b) + (C/100 x c) Part B Leucippus Leucippus was an early pre-Socratic ancient Greek philosopher who lived sometime during the 5th century BCE. Not much of Leucippus early life is known due to the fact that not many of his dates were recorded. What we do know is that he was an Ionian Greek that studied at an Ionian school of naturalistic philosophy. At around 440 BCE Leucippus founded a school at Abdera, which his famous pupil Democritus attended. Around this time he proposed the theory of atomism. According to this atomism, the universe is composed of two elements: the atoms and the void in which they exist and move. This theory was later explained in much greater detail by his pupil Democritus. Leucippus contributed indirectly towards the development of the periodic table since he proposed the first idea of atoms. Thanks to his ideas the foundation for the periodic table was possible. Without his ideas the way we view the world may be completely different. We will write a custom essay sample on Periodic Table Research Task specifically for you for only $16.38 $13.9/page Order now We will write a custom essay sample on Periodic Table Research Task specifically for you FOR ONLY $16.38 $13.9/page Hire Writer We will write a custom essay sample on Periodic Table Research Task specifically for you FOR ONLY $16.38 $13.9/page Hire Writer Democritus Democritus was an influential pre-Socratic ancient Greek philosopher who lived from circa 460 BCE to circa 370 BCE. He inherited his father’s vast fortunes and used it to travel the world and visit many countries on his quest of knowledge. During these trips he met many scholars who taught many lessons. When he finally came back to his native land he became interested in natural philosophy. At the around 440 BCE he became associated with a school in Abdera, which was founded by Leucippus, his mentor. His teacher was the first one to propose atoms, but Democritus later adopted this into his own atomic theory. His theory stated that everything contains tiny particles called atoms and that they were indivisible. He hypothesised that these atoms cannot be destroyed, that they were invisible that they were always and moving. He also stated and that they differ in size, shape, mass, position, and arrangement. Democritus contributed indirectly to the development of the periodic table. His contribution helped people to understand what an atom was and helped other scientist’s further look into science of the atom, which in turn led to the creation of the atomic table. Aristotle Aristotle was an ancient Greek philosopher who lived from 384 BCE to 322 BCE. He was the student of the ancient Greek philosopher Plata and the teacher to one of the greatest military commanders in the world Alexander the Great. He taught many subjects including physics, metaphysics, poetry, theatre, music, logic, rhetoric, linguistics, politics, government, ethics, biology, and zoology. He is considered to be one the most important figures in Western philosophy due to his writings encompassing morality, aesthetics, logic, science, politics, and metaphysics. One of his most well-known theories is that all mater is made from five elements. These elements are fire, water, air, earth and the fifth element aether. He believed all matter was made from a combination of the four elements except the stars and planets which are made of the fifth element aether. Even though Aristotle’s theory was wrong he contributed indirectly to the periodic table. The periodic table consists of elements and he hypothesised that elements exist. John Dalton John Dalton was an English chemist, meteorologist and physicist. He was born on the 6th of September 1766 and died on the 27th of July 1844. He began to study at a local village school and at the age of 12 began to teach there. At the age of 15, he began to teach at a Quaker school in Kendal. After teaching here for 10 years he moved to Manchester as a teacher. While there he joined the Manchester Literary and Philosophical Society, which provided him laboratory facilities. The first paper he presented was about colour blindness which he suffered from. Dalton arrived to atomism by his fascination of meteorology. Dalton stated that the forces of repulsion thought to cause pressure acted only between atoms of the same type. From here on he proceeded to calculate the atomic weight of atoms from percentage compositions of compounds. After this he developed his own atomic theory, which completely revolutionised the way we see the world today. Dalton contributed indirectly to the development of the periodic table. Dalton’s information on atomic weights was a huge factor in the creation the periodic table. He also proposed a chemical symbols for some elements. Without Dalton’s ground-breaking work the periodic table would not be possible. Johann Doberiener Johann Wolfgang Doberiener was a German chemist who was born on the 13th of December 1780 and died on the 24th of March 1849. Doberiener had little opportunity for formal schooling, and so he was apprenticed to a pharmacist. He began to read widely, and attended scientific lectures whenever he received the chance. In time he became a professor at the University of Jena in 1810. During the period of 1815-29, Johann Doberiener arranged elements in order of their atomic weight. He sorted these elements into groups of three, which became known as the law of triads. He arranged them according to the atomic weight of the middle element to the average atomic weight of the remaining two. Doberiener contributed indirectly toward the development of the periodic table. Though his method was discarded due to the fact it didn’t apply to all the elements, Doberiener gave rise to new ways to classify the elements which greatly helped in the creation of the periodic table. John Newlands John Alexander Reina Newlands was an English chemist who worked on the development of the periodic table. He was born in London on the 26th of November of 1837 and died on the 29th of July 1898. He did not study at a normal school but was rather home schooled by his father. He went on to study at the Royal College of Chemistry. In 1863, he set up a practice as an analytical chemist and in 1868 he became the chief chemist at James Duncan’s London sugar refinery. He later left this profession and in 1864 published his concept of the periodicity of the chemical elements. He arranged all 62 elements (known at the time) into a table based upon the ascending order of the atomic weights. He observed that every 8th element in his table displayed similar properties. He named this discovery the Law of Octaves and stated that an element exhibits behavior that is similar to the eighth element preceding/succeeding it. John Newlands contributed indirectly to the development of the periodic table. Even though Newland’s table was not accepted, his work helped to lead Mendeleev (the father of the periodic table) on the right track thus greatly contributing to creation of the periodic table. Dmitri Ivanovich Mendeleev Dmitri Ivanovich Mendeleev was a Russian chemist and inventor. He was born in Siberia in 1834 and died in 1907. He is considered the father of the periodic table because he created the first version of the periodic table of element and used it to predict elements yet to be discovered. In 1849 his family relocated to St. Petersburg and Mendeleev entered the Main Pedagogical Institute in 1850. He studied science there and graduated in 1856. In 1863 Mendeleev was appointed to a professorship in the University he studied in. In 1864 Dmitri Mendeleev produced his greatest achievement: the periodic table of elements. He arranged the 66 elements known at the time by their atomic weight. By doing this he managed to organise them into groups possessing similar properties. If a gap existed in his table, he anticipated that a brand new element would one day be discovered and he predicted its properties. Some of the elements he predicted were later found and provided great evidence towards the accuracy of his table. Dmitri Mendeleev contributed directly towards the development of the periodic table since he developed it. Mendeleev’s original periodic table of elements is the model of the modern day periodic table of elements and thanks to his discovery we have a greater understanding of the universe. Henry Moseley Henry Gwyn Jeffreys Moseley was an English physicist who was born in England on the 23rd of November 1887 and died on the 10th of August 1915 at Gallipoli. As a young boy Moseley studied at Summer Fields School where he was awarded a King’s scholarship to attend Eton College. In 1906, Moseley entered Trinity College of the University of Oxford, where he earned his bachelor’s degree. In 1910, Moseley began to study under Sir Ernest Rutherford. In 1913, he moved back to Oxford, where he was given laboratory facilities. While at Oxford, Moseley measured the x-ray spectral lines of nearly all the elements known at the time. The results of his study showed a clear and simple progression of the elements that was based on the number of protons in the atom’s nucleus, rather than the order based on atomic weights that was then the basis of the periodic table. Moseley contributed indirectly to the development of the periodic table. He discovered the atomic number of elements which revolutionised the way the elements were sorted. Now thanks to him the modern periodic table is sorted by atomic number. Timeline of The Periodic Table 440 BCE Democritus and Leucippus put forward the idea of the atom, an indivisible particle that all matter is made of. 30 BCE Aristotle proposes his theory about the four elements which are earth, air, fire water. He also proposes a fifth element aether, which the stars and planets were made of. 360 BCE Plato coins term the term ‘elements’. 1605 CE Sir Francis Bacon published â€Å"The Proficience and Advancement of Learning† which contained a description of what would later be known as the scientific method which is the acquirement of new knowledge or the correction of existing knowledge. 1661 CE Robert Boyle published â€Å"The Sceptical Chymist† which was a written work on the distinction between chemistry and alchemy. It also contained some of the first ideas of atoms, molecules, and chemical reactions. 1754 CE Joseph Black isolated carbon dioxide, which he called â€Å"fixed air†. 1778 CE Antoine Lavoisier wrote the first detailed list of elements. The list contained 33 elements differentiated between metals and non-metals. 1766 CE Henry Cavendish discovered hydrogen was a colourless, odourless gas that burns and can form an explosive mixture with air. 1773–1774 CE Carl Wilhelm Scheele and Joseph Priestly independently isolated oxygen. 1803 CE John Dalton proposed â€Å"Dalton’s Law† which described the bond between the components in a mixture of gases. 828 CE Jons Jacob Berzelius created a table of atomic weights and introduced letters to represent elements. 1828 CE Johann Doberiener developed groups of 3 elements with similar properties, which he called triads. 1864 CE John Newlands organised the known elements in order of atomic weights and observed resemblances be tween some elements. 1864 CE Julius Lothar Meyer develops an early version of the periodic table, with 28 elements classified by valence. 1864 CE Dmitri Mendeleev produced a table based upon atomic weights but organised ‘periodically’ with elements of congruent properties under each other. His Periodic Table included the 66 elements known at the time, classified by their atomic weights. 1894 CE William Ramsay discovered the Noble Gases. 1898 CE Marie and Pierre Curie isolated radium and polonium from pitchblende. 1900 CE Sir Ernest Rutherford discovered the cause of radioactivity was decaying atoms. 1913 CE Henry Moseley discovered the atomic number of each of the elements which changed the way the periodic table was organised. 1940 CE Edwin McMillan and Philip H. Abelson discover neptunium, the lightest and first synthesized transuranium element, found in the products of uranium fission. 1940 CE Glenn Seaborg arranged the transuranic elements (the elements after uranium in the periodic table) below the periodic table making it easier to read. Reference List tutorvista. com. Daltons Atomic Theory. [ONLINE] Available at: http://chemistry. tutorvista. com/inorganic-chemistry/dalton-s-atomic-theory. html. [Accessed 23 March 13]. citycolligiate. com. Daltons Atomic Theory. 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