Question

what does the n123etc in the periodic table indicated​

Answer 1

A period in the periodic table is a row of chemical elements. All elements in a row have the same number of electron shells. Each next element in a period has one more proton and is less metallic than its predecessor.

Answer 2

Explanation:

All elements in a row have the same number of electron shells. Each next element in a period has one more proton and is less metallic than its predecessor.

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