Which metal is not required to have its charge specified in the names of ionic compounds it forms?

Question

Quizplus · Accepted Answer

Calcium (Ca) is an alkaline earth metal and always forms a 2+ cation, so its charge does not need to be specified in the name of an ionic compound. On the other hand, Mn (manganese) can form cations with different charges (+2, +3, +4, +6, +7), Fe (iron) can form cations with charges of +2 and +3, Cu (copper) can form cations with charges of +1 and +2, and Pb (lead) can form cations with charges of +2 and +4. Therefore, the charges of these metals need to be specified in the names of the ionic compounds they form.

Which Metal Is Not Required to Have Its Charge Specified