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The Greek philosopher, Democritus, came up with the idea that if a matter is cut up into pieces, you would end up with particles.
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Aristole believed in his own ideas; all matters were made up of five elements: fire, water, earth air and aither. His theory was used for about 2000 years until a scientific solution came along.
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Robert Boyle was able prove that elements are the basic constituents of material bodies. Also, he came up with a way to distinguish mixtures and compounds and be able to detect their ingredients.
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Isaac Newton worked in the field of optics; his research became successful and created Newton's Theory of Color.
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Joseph Louis Proust created the 'law of definite proportions'. It states that all pure substance are made up of the same elements combined in the same proportions by weight.
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Joseph Priestly was the founder of an important element, oxygen.
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John Dalton was able to figure out that all atoms were small spheres with different properties such as size colour and mass.
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Dmitri Mendeleev created the periodic table that is similar to the modern periodic table, He was able to put all the elements into a certain order and also made sure to leave room in the table for elements yet to be discovered.
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J. J Thomson believed that an atom was made up of a combination of particles. In order to test his theory, he used a cathode ray tube and discovered both negatively and positively charged particles known as electrons and protons.
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Niels Bohr was able to discover energy levels and how each shell can only hold a specific amount of electrons.
