I recently came across a practice problem in my textbook asking me to name a few compounds using -ic and -ous endings. The exact wording is:
Write the name of each of the following ionic substances, using -ous and -ic endings to indicate the charge of the cation.
The first one was CoCl2. However, cobalt has more than just two oxidization states (3, 2, 0, and -1).
So if it is one of the states in the middle, how do I decide whether to use -ous or -ic