Question

In the iso electronic species the ionic radii ($A^O$) of $N^{3-}$, $O^{-2}$, $F^{-}$ are respectively given by

• A. 1.36, 1.40, 1.71
• B. 1.36, 1.71, 1.40
• C. 1.71, 1.40, 1.36
• D. 1.71, 1.36, 1.40

Answer 1

The correct option is C

1.71, 1.40, 1.36

$N^{3-}$, $O^{-2}$, $F^{-}$ have 8 electrons in the outermost shell,so they are isoelectronic.

And we know that more the negative charge, larger the size among iso electronic species.

Hence , C is the correct option.