## Chemistry: The Central Science (13th Edition)

Nitrate ion ($NO_{3}^{-}$) has a -1 charge. Chromium ion has a +3 charge. In order to balance charge, 3 atoms of nitrate ion should be present. Thus, the chemical formula will be $Cr(NO_{3})_{3}$. Therefore the name of the ionic compound is Chromium (III) nitrate.