Chapter 2 - Atoms, Molecules, and Ions - Questions and Exercises - Questions - Page 83: 2.20

With CrCl$_3$, we need to include a Roman numeral to denote the valence of chromium. Chromium, a transition metal, like most transition metals, has more than one valence. In this compound, we can see that chromium has a valence of 3+, which is balanced by the charge of 3 chloride ions (combined charge of 3-). Therefore, this chromium atom is a chromium (III) atom. The correct name for this compound would be chromium (III) chloride.

With CrCl$_3$, we need to include a Roman numeral to denote the valence of chromium. Chromium, a transition metal, like most transition metals, has more than one valence. In this compound, we can see that chromium has a valence of 3+, which is balanced by the charge of 3 chloride ions (combined charge of 3-). Therefore, this chromium atom is a chromium (III) atom. The correct name for this compound would be chromium (III) chloride.