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14 July, 07:21

What does the whole number on the periodic chart mean?

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  1. 14 July, 07:32
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    The whole number on the periodic table of elements, represent the atomic number which is the amount of proton in the element.

    If you are referring to the numbers above each row, those are the groups which elements are classified on to. This number also determines the reactivity of that element.
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