What is the effect of the number of energy levels on the radius of an atom?

the number of energy levels increases as you move down a group! as the number of electrons increases each subsequent energy level is further from the nucleus than the last.

so

the atomic radius increases as the group and energy levels increase

explanation:

as you go across a period, electrons are added to the same energy level. at the same time, protons are being added to the nucleus. the concentration of more protons in the nucleus creates a higher effective nuclear charge,

so like basically,

there is a stronger force of attraction pulling the electrons closer to the nucleus resulting in a smaller atomic radius.

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