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Gave the idea of an Atomic Theory with, based on measurable mass properties, spherical solid atoms.
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Group elements with similarities into 7 groups. Found that the properties of the elements periodic functions of their atomic weights.
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Determined the charge of mass ratio: (e/m) of an electron=1.759 x 10 8, using a CRT.
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Found that electrons were located outside the nucleus; which was dense, small, and positively charged. (not sure about specific date)
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Explained that atomic structure underlies regularities of the periodic table of elements. (not sure about specific date)
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Done the first controlled chain reaction which released energy from the atoms nucleus.
