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Why they call it "Periodic Table"?

Why they call it "Periodic Table"?
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Why they call it "Periodic Table"?

User Seth Nelson
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the periodic table has rows running left to right and colums running up and down.
User David Ferris
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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
User Radoslav Georgiev
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