Atomic radii decreases in a Period, but increase down a Group.
Atomic Radii is the total distance from the nucleus of an atom to the outermost shell of its electron. Atomic radii decreases when we move from left to right in a Period due to addition of nuclear charge inside the nucleus but increase down a Group because of the addition of new shells
So we can conclude that Atomic radii decreases in a Period, but increase down a Group.
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