Among $M g$ , $M g^{2 +}$ , Al and $A l^{3 +}$ which will have the largest and the smallest size respectively?

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Solution

$_{12} M g M g^{2 +}_{13} A l A l^{3 +}$
no. of $e^{-}$ $12$ $10$ $13$ $10$
no. of $p^{+}$ $12$ $12$ $13$ $13$
as we move from left to right in a period ionic radii decreases due to increase in effective nuclear charge. $∴$ $A l > M g$
and also higher is the cationic charge smaller is the ionic radii due to the increase in effective nuclear charge .
Hence, $A l^{3 +} < M g^{2 +} < A l < M g$

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