1.

The isoelectronic species K^(+),Cl^(-),S^(2-) and Ca^(2+) can be arranged in the following decreasing order of size:

Answer»

`CA^(2+)gtK^(+)GTCL^(-)gtS^(2-)`
`Cl^(-)gtS^(2-)gtK^(+)gtCa^(2+)`
`S^(2-)gtCl^(-)gtCa^(2+)gtK^(+)`
`S^(2-)gtCl^(-)>K^(+)gtCa^(2+)`

Solution :Size decreases with increase in nuclear CHARGE in an iso -electronic series. The nuclear charge INCREASES as:
`(S^(2-)""Cl^(-)""K^(+)""Ca^(2+)),(+16""+17""+19""+20)`


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