What does the period number of an atom indicate? A. Period numbers are equal to the number of valence electrons in an atom. B. Period numbers are equal to the number of orbital rings in an atom. C. Period numbers are equal to the number of protons in an atom. D. Period numbers are equal to the size of an atom.

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Leticia Lam

1 January, 07:07

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Ann · Answer 1

Answer is B

Explanation:

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