The ionic radii of `N^(3-), O^(2-)` and `F^(-)` are respectively given by:

Options

A. 1.71 , 1.40 and 1.36
B. 1.71 .1.36 and 1.40
C. 1.36 , 1.40 and 1. 71
D. 1.36 . 1.71 and 1.40

Answer

A

Explanation

`N^(3-) (7+ 3= 10) ,O^(2-) (8+2 =10)`
and `F^(-) (9+ 1=10) ` are isoelectronic ions .
Amongst isoelectronic ions, greater the negative charge on the anion , larger is the ionic radius , Thus ionic radii decreae in the order `N^(3-) (1.71 Å ) lt`
`O^(2-) (1.40 Å ) gt F^(-) (1.36 Å ) . i.e., ` option (a) is correct .