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The correct order of the decreasing ioni...

The correct order of the decreasing ionic radii among the following isoelectonic species is

A

`Ca^(2+) gt Cl^(-) gt S^(2-) gt P^(3-)`

B

`S^(2-) gt P^(3-) gt Cl^(-) gt Ca^(2+)`

C

`P^(3-) gt S^(2-) gt Cl^(-) gt Ca^(2+)`

D

`Ca^(2+) gt Cl^(-) gt S^(2-) gt P^(3-)`

Text Solution

Verified by Experts

The correct Answer is:
D
`._(15)P^(3-),._(16)S^(2-),._(17)Cl^(-)` belong to 3rd period wheras `._(20)Ca^(2+)` belong to 4th period. These are isoelectronic ions and therefore size depends on nuclear charge. More is nuclear charge smaller is size
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