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

Since Chromium has more than one ionic charge, we will start with the anion. The anion is the Hydroxide ion OH$^{-}$. It has a 1- charge. But since there are three Hydroxide ions in the compound, there is 3- charge from the negatively charged ions. In order for the compound to have a net neutral charge, the chromium atom must have a 3+ charge, making it Chromium (III).