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The ions O^(-2),F^(-),Mg^(2+) and Al^(3+...

The ions `O^(-2),F^(-),Mg^(2+) and Al^(3+)` are isoelectronic. Their ionic radii show

A

a decreases from `O^(2-)` to `F^(-)` and then increases from `Na^(+)` to `Al^(3+)`

B

a significant increase from `O^(2-)` to `Al^(3+)`

C

a significant decrease from `O^(2)` to `Al^(3+)`

D

an increases from `O^(2-)` to `F^(-)` and then decrease from `Na^(+)` to `Al^(3+)`.

Text Solution

Verified by Experts

The correct Answer is:
C
For isoelectronic species more the nuclear charges lesser is the ionic radius.
`O^(2-) (Z=8) , F^(-) (Z=9), Na^(+) (Z=11) , Mg^(2+) (Z=12), Al^(3+) (Z=13)`. Thus `O^(2-)` largest and `Al^(3+)` is smallest
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