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Anionic Radius

Which one of ...

Question

Which one of the following is the smallest in size?

N^{3 -}

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O^{2 -}

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F^{-}

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N a^{+}

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Solution

The correct option is D $N a^{+}$
Here, all four species are isoelectronic.
We know,
In an Isoelectronic species as the effective nuclear charge increases size decreases.
Here $N a^{+}$ is having most protons so it will be having highest nuclear charge, thus smallest size.

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