Periodic Table Research Task

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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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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.
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