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Consider the isoelectronic species, Na^(...

Consider the isoelectronic species, `Na^(+),Mg^(2+),F^(-)` and `O^(2-)`. The correct order of increasing length of their radii is:

A

`F^(-) lt O^(2-) lt Mg^(2+) lt Na^(+)`

B

`Mg^(2+) lt Na^(+) lt F^(-) lt O^(2-)`

C

`O^(2-) lt F^(-) lt Na^(+) lt Mg^(2+)`

D

`O^(2-) lt F^(-) lt Mg^(2+) lt Na^(+)`

Text Solution

Verified by Experts

The correct Answer is:
B
Amongst isoelectronic species ionic radii increase as the + ve charge decreases or the negative charge increases. Thus the ionic radii increase in the order `:Mg^(2+) lt Na^(+) lt F^(-) O^(2-)` i.e., option ( b) is correct .
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