State the $IUPAC$ name of the following complex: Sodium cobaltinitrite.

(N/A) The chemical formula for Sodium cobaltinitrite is $Na_{3}[Co(NO_{2})_{6}]$.
In this complex,the central metal ion is $Co^{3+}$,and the ligand is $NO_{2}^{-}$ (nitrito-$N$).
There are $6$ nitrito-$N$ ligands,so the prefix is 'hexanitrito-$N$'.
The oxidation state of $Co$ is calculated as: $x + 6(-1) = -3$,which gives $x = +3$.
Thus,the $IUPAC$ name is Sodium hexanitrito-$N$-cobaltate$(III)$.