Which of the following have the largest ionic size?

F^{-}

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O^{2 -}

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N a^{+}

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M g^{2 +}

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Solution

The correct option is A $O^{2 -}$
All species are isoelectronic. They have 10 electrons.

$O^{2 -}$ has a least nuclear charge ( due to lowest atomic number) and hence has the largest ionic size as few positive charges are attracting more negative charges.

The correct order of ionic size:
$O^{2 -} > F^{-} > N a^{+} > M g^{2 +}$

Hence, option B is correct.

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Similar questions

N^{3 -}, N a^{+}, F^{-}, O^{2 -}, M g^{2 +}

N^{3 -}, N a^{+}, F^{-}, O^{2 -}, M g^{2 +}

N^{3 -}

N a^{+}

F^{-}

M g^{2 +}

O^{2 -}

{M g}^{2 +} < {N a}^{+} < F^{-} < O^{2 -} < N^{3 -}

F^{-}, O^{2 -}, N a^{+}, M g^{2 +}

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