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What does the period number indicate on periodic table
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What does the period number indicate on periodic table

User Cruncher
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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.
User Ayoub K
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It’s atomic mass is what the number means.
User FarrEver
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