Which of the following statement is correct regarding alkali metals

Cation is less stable than the atom

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Cation is smaller than the atom

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Size of cation and atom is the same

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Cation is greater in size than the atom

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Solution

The correct option is B
Cation is smaller than the atom

After removal of an electron the effective nuclear charge per electron increases hence the size decreases.

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The radius of $N a^{+}$ cation is less than that of Na atom. Give reason.

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