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The correct order of radii is...

The correct order of radii is

A

`N lt Be lt B`

B

`F^(ɵ)lt O^(2-) lt N^(3-)`

C

`Na lt Li lt K`

D

`Fe^(3+)lt Fe^(2+)lt Fe^(4+)`

Text Solution

Verified by Experts

The correct Answer is:
B
`F^(ɵ) lt O^(2-) lt N^(3-)`
All of these are isoelectronic ions (10 electrons).
In isolectronic species, as the number of protons (atomic number) goes on increasing, size goes on decreasing due to stronger attraction on the electrons (Z for N, O and F=7, 8 and 9).
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