Why does the atomic radius decrease as electrons are added to a shell?

The more protons there are, the more electrons get attracted, making the size smaller.

Explanation:

hey there,

< It is just a rule that electrons get attracted to protons. And in neutral atoms, the protons and electrons are the same, so when there are more protons, there are also more electrons. When they get attracted to the protons in the nucleus, that makes the size of the atom smaller, making the atomic radius decrease. So atomic radius decreases down a row (from left to right). >

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