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19-05-2018
Chemistry

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What does the period number indicate on periodic table

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pcgroh17oyrf80 pcgroh17oyrf80

19-05-2018

It’s atomic mass is what the number means.

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20-05-2018

The period number indicates what electron shell level is being filled. For example, Magnesium is the second element in the third period, which means that there are two electrons in the third shell, assuming that it is neutral.

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