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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
In case of isoleclectric species ionic radii `propto` 1/atomic number
The ionic radii increase as the positive charge decrease or the negative charge increase.
Ion `Mg^(2+)` lt`Na^(+)` lt`F^(-)` lt`O^(2-)`
Atomic number (12) (11) (9) (8)
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