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

Brief Explanations:

The problem is about naming ionic compounds. Calcium (Ca) is a group 2 metal with a fixed charge of (2+), so (CaS) is named calcium sulfide. Cadmium (Cd) is a transition metal (even though it's in group 12, it can be considered in the context of naming like transition metals which often use the Stock system). Since Cd can have variable charges (in reality, Cd usually has a (2+) charge, but in the naming convention for compounds with metals that can have multiple charges - even if in some cases it's fixed, the Stock system is used as a general rule for metals not in groups 1 - 2 and Al, Zn, Ag). So (CdS) is named cadmium(II) sulfide. The key difference is that (CaS) uses the element name of the cation (calcium) without a Roman numeral (as Ca has a fixed charge), while (CdS) uses the Stock system (cadmium(II)) to indicate the charge of the cation (even if Cd's common charge is (2+), the naming convention for metals that are not in the fixed - charge main - group (groups 1 - 2) uses the Stock system).

Answer:

The name of (CaS) is calcium sulfide (uses the element name of the cation directly as Ca has a fixed charge). The name of (CdS) is cadmium(II) sulfide (uses the Stock system with a Roman numeral to indicate the charge of the cation, following the naming convention for metals that are not in groups 1 - 2).