Na⁺ is smaller than Na atom because:

Sodium atom has one electron lesser than sodium ion.

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The effective nuclear charge is greater in case of sodium ion.

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Nucleus in each case contains different nucleons.

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Na⁺ is more stable than in Na atom.

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Solution

The correct option is B
The effective nuclear charge is greater in case of sodium ion.

The total number of electrons is 10 in case of Na⁺ and 11 in case of Na, while the number of proton is same i.e. 11 in both case.

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