Question

The common features of the species $N_2^{2-},O_2$ and $N{O}^{-}$ are:

• A. bond order is three and are isoelectronic
• B. bond order is two and are isoelectronic
• C. bond order is three but are not isoelectronic
• D. bond order is two but are not isoelectronic

Answer 1

The correct option is B bond order is two and are isoelectronic

$N_2^{2-}=\frac{10-6}{2}=2$

$O_2=\frac{8-4}{2}=2$

${NO}^{-}=\frac{10-6}{2}=2$

Note:All the above molecules have bond order $2$

No.of electrons in a) $N_2^{2-}$ = {7x2}+2=16 electrons

b) $O_2$ = (8x2)=16 electrons

c) ${NO}^{-}$ = 7+8+1=16 electrons

Hence all the three molecules are iso electronic too