Question

What is a Period? a. Columns on the periodic table; stand for the number of valence electrons in the atomic structure b. Columns on the periodic table; stand for the number of electron shell in the atomic structure c. Rows on the periodic table; stand for the number of electron shell in the atomic structure
d. Rows on the periodic table; stand for the number of valence electron in the atomic structure

Answer 1

Answer:

periods is the verticle rows divided into 7 parts.

Explanation:

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