This Day in Science History - January 31 - Theodore Richards
(About.com) January 31st is Theodore William Richards' birthday. Richards was an American chemist who gave the first chemical evidence of the existence of isotopes. An element is determined by the number of protons that make up its nucleus. An isotope of an elem
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updated 981 (Chemistry), inserted 10, updated 0, at 2012-05-28 11:02:56
