Which one of the following constitutes a group of the isoelectronic species ?

Options

A. `C_2^(2-), O_2^(-), CO, NO`
B. `N_2, O_2^(-), NO^(+), CO`
C. `CN^(-), N_2, O_2^(2-), C_2^(2-)`
D. `NO^(+), C_2^(2-), CN^(-), N_2`

Answer

D

Explanation

Isoelectronic species have the same electronic configuration due to the same number of electrons.
`C_2^(2-)=6+6+2=14, O_2^(-)=8+8+1=17`
`CO=6+8=14, NO=7+8=15, N_2=7+7=14`
`NO^(+)=7+8-1=14, CN^(-)=6+7+1=14`