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Ca^(2+) has a smaller ionic radius than ...

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

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The correct Answer is:
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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