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NEET levelSingle correct optionDifficulty 1 of 3pt062

The radius of the sodium cation $Na X^{+}$ is smaller than that of the sodium atom mainly because:

Athe nuclear charge decreases on losing an electron
Bthe outermost ( $3 s$ ) shell is lost and the remaining 10 electrons are pulled by the same nuclear charge of $+ 11$
Cthe $2 p$ electrons repel each other more strongly in the cation
Dthe cation has more shells than the atom

Answer: B

Removing the lone

3 s

electron removes the entire third shell, and the same

+ 11

nucleus now holds fewer electrons, so

Z_{eff}

per electron rises. The cation is smaller.

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