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What happens to atomic radii in a group ...

What happens to atomic radii in a group and period and why ?

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Atomic radius is the distance between the centre of an atom and its outermost shell
In a period atomic radius generally decreases from left to right.
In a period there is a gradual increase in the nuclear charge. Since valence electrons are added in the same shell, they are more and more strongly attracted towards nucleus. This gradually decreases atomic radii. Atomic radii increases In a group from top to bottom:
As we go down a group, the number of shells increases and valence electrons are present ih a higher shell and the distance of valence electrons from nucleus increases. Also, the number of filled shells between valence electrons and nucleus increases both the factors decrease the force of attraction between nucleus and valence electron. Therefore, atomic size increases on moving down a group
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