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24 February, 22:56

Dimitri Mendeleev created the blank in the 1860s

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  1. 25 February, 00:07
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    In 1864, with about 50 elements known, the British chemist John Newlands noticed a pattern when he arranged the elements in order of atomic mass, or weight. He found that the properties of the elements seemed to repeat every eighth element.
  2. 25 February, 02:17
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    periodic table he created it in 1860 while trying to organize the elements
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