Periodic Table Research Task Essay

2749 Words Mar 15th, 2013 11 Pages
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.
3) Atoms of a particular element are identical in mass, size, shape and other properties.
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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 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

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