Gym · Ionic nomenclature

Naming ionic compounds: formula ↔ name

Name an ionic compound from its formula, and write the formula from the name — both directions, including the Stock system (iron(III), copper(I)) for variable-charge metals. The formula is assembled by machine-verified charge crossover; every wrong option is a specific naming mistake (wrong oxidation state, charges used as subscripts, or covalent prefixes on an ionic compound).