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9 July, 10:21

Why they call it "Periodic Table"?

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Answers (2)
  1. 9 July, 12:11
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    The periodic table has rows running left to right and colums running up and down.
  2. 9 July, 13:33
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    Scientists finally found the reason for the periodicity of the elements: Valence electrons. And so the table became known as the Periodic Table
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