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Atomic Radius in a Period

APCHEM-G5QJJ3

Which of the following correctly explains why the atomic radius decreases going across a period from left to right?

A

As you cross the period from left to right, the number of electron orbital shells decreases as the number of protons remains constant.

B

As you cross the period from left to right, the number of protons decreases as the number of electron orbitals remains constant.

C

As you cross the period from left to right, the number of electron orbital shells increases as the number of protons remains constant.

D

As you cross the period from left to right, the number of protons increases as the number of electron orbitals remains constant.