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The atomic radius is the distance from the atomic nucleus to the outermost stable electron orbital in an atom that is at equilibrium. The atomic radii tend to decrease across a period from left to right. The atomic radius usually increases while going down a group due to the addition of a new energy level (shell).
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It should be noted that atomic radii of main group elements increases down a group.

What is atomic radius?

The atomic radius  can be regarded as the measure of the size of its atom which us the distance from the center of the nucleus.

 Therefore, atomic radii of main group elements increases down a group and decrease across the period.

Learn more about atomic radius at;

https://brainly.com/question/15255548