The chemical formula for tin(II) nitride is Sn3N2. The chemical symbol Sn is used to represent tin, while the chemical symbol N is used to represent nitrogen.
An ion is an element or chemical compound with either a positive or negative charge. When two ions, such as tin(II) and nitride combine, they form a molecule: a chemical compound with no charge. Tin(II) has a charge of +2, while the nitride has a charge of -3. In the compound tin(II) nitride, the total charge of +6 for the three atoms of tin is balanced by the total -6 charge for the two atoms of nitrogen. Tin(II) nitride may also be called stannous nitride.