What does the period number indicate on periodic table

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asked Nov 12, 2019 171k views

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Ayoub K · Answer 1 · 2019-11-13T11:30:03+0000

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.

What does the period number indicate on periodic table

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