Chemistry Assessment Task : Robert Boyle

3018 Words Mar 4th, 2015 13 Pages
Chemistry Assessment Task 1
Michelle Chen 11CH5

Question 1:
1660 – Robert Boyle defined elements and compounds, which are the basis of the periodic table.
1778 – Antoine Lavoiser distinguished the elements into 4 categories: metals, non-metals, elastic fluids (gases) and earths. This was the first classification of the elements.
1828 – Jakob Berseius arranged the first table of elements according to atomic masses, and introduced symbolising elements with elements.
1828 – Johann Dobereiner grouped elements with similar properties into triads. This was the first attempt to class elements into groups based on their properties.
1864 – John Newlands continued the work of Dobereiner. He ordered the elements according to atomic weights and he drew up the first periodic table. He found that every eight elements had similar properties (the law of octaves).
1864 – Lothar Meyer ordered the elements by their periodicity based on their atomic mass and volume.
1864 – Dmitri Mendeleev proposed that undiscovered elements could be found, judging by what other elements were surrounding it. Based on this, he predicted that there was an element after silicon with similar qualities. He was proven right years later.
1894 – William Ramsay found that there were a number of gases that did not react with other elements. These were called the noble gases, and he added them onto Mendeleev’s periodic table.
1897 – J. J. Thompson discovered the electron. He used electrons to explain why…

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