Question

26 sep use models other than the names of the ions, how does the name of cas differ from the name of cds?

Explanation:

Calcium (Ca) is a main - group metal with a fixed charge (\(Ca^{2+}\)), so its compound CaS is named calcium sulfide. Cadmium (Cd) is a transition metal. Transition metals often have variable charges. For CdS, since Cd can have multiple oxidation states, its name is cadmium(II) sulfide to specify the charge of the cadmium ion.

Answer:

CaS is named calcium sulfide (the metal part has a fixed charge and no Roman numeral is needed). CdS is named cadmium(II) sulfide (the transition metal part has a variable charge and a Roman numeral is used to indicate its charge in the compound).