Question

What is atomic radius? Why does atomic radius decrease across a period?

Answer 1

Answer:

Atomic radius decreases across a period because valence electrons are being added to the same energy level at the same time the nucleus is increasing in protons. The increase in nuclear charge attracts the electrons more strongly, pulling them closer to the nucleus.

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Answer 2

$\mathbb{ \ \ A\ N\ S\ W\ E\ R\: \: }$

Atomic radius is the distance between the nuclei of two identical atoms bonded together.