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Democritus proves that all matter is made up of atoms
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Lavoisier came up with the Law of Conservation of Mass
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Proust discovers that every pure chemical compound consists of elements in proportions.
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Dalton came up with five assumptions to go along with is thoery, such as atoms being solid balls.
You cannot change or destroy atoms. -
Thomson comes up with the idea of the Plum Pudding Model. He also proved the idea of isoptopes being in a stable element.
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He found the charge of an electron with an oil-dropped appartus.
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Becquerel exposed uranium-bearing crystal to sunlight
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They studed radioactivity and discovered polonium and rdium.
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His planetary model led us to learn and understand the structure of an atom.
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Chadwick worked with Rutherford and discovered the proton. Chadwick discovered the atomic number of an element was less than the atomic mass. Also, discovered the nuetron did exist and it is .1 percent more than a proton.
