Hg(NO2)2
HgO, this is formula for mercuric oxide.
Formula: HgI2
Mercuric or mercury II chloride is HgCl2
Mercuric oxide or mercury (II) oxide : HgO
HgI2
Nitrite: NO2-
Formula: Cu3N
metal
The Chemical Formula for Zinc Nitrite is Zn(NO2)2.
The nitrite ion is NO2-1
The formula for barium nitrite monohydrate is Ba(NO2)2.H2O.