1.

`Ca^(2+)` has a smaller ionic radius than `K^(oplus)` because it has `"………" .

Answer» Correct Answer - Higher charge density
`Ca^(2+)` has a smaller ionic radius than `K^(o+)` because it has higher charge density `(("charge")/("size") "ratio")`. In isoelectronic species, as the number of protons (atomic number) goes on increasing, size goes on decreasing due to stronger attraction on the electrons.


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