What is NO_2 called?

Jan 9, 2017

$\text{Nitrogen(IV) dioxide..........}$

Explanation:

Or $\text{dinitrogen tetroxide}$.

The Lewis structure of ${\text{NO}}_{2}$ features a lone electron on the formally positive nitrogen centre, and this can rationalize the formation of ${\text{N"_2"O}}_{4}$, $\text{dinitrogen tetroxide}$:

$2 \left({\text{O"=dot"N"^(+)-"O"^(-))rightleftharpoons(""^(-)"O")("O"=)"N"^(+)-""^(+)"N"(="O")("O}}^{-}\right)$

The nitrogen radicals are conceived to couple to form a $\text{N"-"N}$ bond, in which both centres are still formal cations. What is the formal charge on the dimer?