Why does along moving down the group the radius of the atom increases?

1.	Why does along moving down the group the radius of the atom increases??
Answer» As we goes down the group the number of shell increases and because of increase of number of Shell the atomic radius increases. 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. Therefore, the atomic radius increases as the group and energy levels increase. Because the number of shells increases.

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