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-)`

Solution :Correct order of increasing ionic radii is
`Ca^(2+)ltK^(+)LTCL^(-)LTS^(2-)`
With increase in nuclear CHARGE. SIZE decrease in isoelecronic species.
`Ca^(2+)(+20)ltK^(+)(+19)ltCl^(-)(+17)ltS^(2-)(+16)`


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