Which one of the following has the largest radius?

N a^{+}

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M g^{2 +}

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O^{2 -}

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A l^{3 +}

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Solution

The correct option is C $O^{2 -}$
$N a^{+}$ , $M g^{+ 2}$ , $O^{2 -}$ and $A l^{+ 3}$ all have $10$ electrons . so these are iso-electronic species .

For iso-electronic species, atomic radii is inversely proportional to Z-effective. Z-effective is directly proportional to the positive charge.

Thus $O^{2 -}$ has largest radius.

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Question 20

In which of the following pairs, the ions are isoelectronic ?

(a) $N a^{+}, M g^{2 +}$ (b) $A l^{3 +}, O^{-}$ (c) $N a^{+}, O^{2 -}$ (d) $N^{3 -}, C l^{-}$

$N a^{+} . M g^{2 +}, A l^{3 +}$ and $S i^{4 +}$ are isoelectronic. The order of their ionic size is

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