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) $N^{3 -}, C l^{-}$

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Solution

For, $N a^{+} = 11 - 1 = 10 e^{-}$

$M g^{2 +} = 12 - 2 = 10 e^{-}$

Thus, they have same number of electrons.

For, $A l^{3 +} = 13 - 3 = 10 e^{-}, O^{-} = 8 + 1 = 9 e^{-}$ .

They do not have same number of electrons.

For, $N a^{+} = 10 e^{-}, O^{2 -} = 8 + 2 = 10 e^{-}$

They have same number of electrons.

For, $N^{3 -} = 7 + 3 = 10 e^{-}, C l^{-} = 17 + 1 = 18 e^{-}$ .

They do not have same number of electrons.

Thus, $N a^{+}$ is isoelectronic with $M g^{2 +} a n d O^{2 -}$

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