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6 September, 03:22

Dimitri Mendeleev created the blank in the 1860s

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  1. 6 September, 03:30
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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. 6 September, 03:36
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    periodic table he created it in 1860 while trying to organize the elements
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