1.

The correct arrangement for the ions in the increasing order of their radii is

Answer»

`NA^(+), Cl^(-), Ca^(2+)`
`Ca^(2+), K^(+), S^(2-)`
`Na^(+), Al^(3+), Be^(2+)`
`Cl^(-), F^(-), S^(2-)`

Solution :
The species `Ca^(2+), K^(+)` and `S^(2-)` are isoelectronic.
For isoelectronic ions, the radius decreases as the nuclear charge increases.
Hence, the increasing order of their RADII is
`Ca^(2+) LT K^(+) S^(2-)`


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