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PtichkaEL [24]
3 years ago
8

What does the period number indicate on periodic table

Chemistry
2 answers:
Ber [7]3 years ago
6 0
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.
anastassius [24]3 years ago
4 0
It’s atomic mass is what the number means.
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Explanation:

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