1.

The increasing order of the ionic radii of the given isoelectronic species is :-

Answer»

`K^(+),S^(2-),CA^(2+),CL^(-)`
`Cl^(-),Ca^(2+),K^(+),S^(2-)`
`S^(2-),Cl^(-),Ca^(2+),K^(+)`
`Ca^(2+),K^(+),Cl^(-),S^(2-)`

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