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Question

Why does the size of atom increases as we go down the group?

A
The number of electrons increase
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B
The new shells are added
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C
The nuclear force increases
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D
The number of electrons decrease
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Solution

The correct option is B The new shells are added
On moving down the group, new shells are being added. The nuclear charge is not enough to reduce the size enough. So the radius increases as we move down the group.

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