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Describe how the name of the ionic compound CaS differs from the name of the ionic compound CdS using the IUPAC nomenclature system and the Stock system of naming.
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Formula -> names
- CaS
- IUPAC name: calcium sulfide (or calcium sulphide)
- Stock name: calcium sulfide
- Reason: Ca is an alkaline‑earth metal with a single common oxidation state (+2), so no Roman numeral is required.
- CdS
- IUPAC name: cadmium(II) sulfide (often written cadmium sulfide in less formal usage)
- Stock name: cadmium(II) sulfide
- Reason: Cd is a d‑block metal; the Stock system (and IUPAC practice for transition/post‑transition metals) indicates the metal oxidation state with a Roman numeral. In CdS the cadmium is +2, hence (II).
Note: British spelling “sulphide” may be seen instead of “sulfide.”
- CaS
- IUPAC name: calcium sulfide (or calcium sulphide)
- Stock name: calcium sulfide
- Reason: Ca is an alkaline‑earth metal with a single common oxidation state (+2), so no Roman numeral is required.
- CdS
- IUPAC name: cadmium(II) sulfide (often written cadmium sulfide in less formal usage)
- Stock name: cadmium(II) sulfide
- Reason: Cd is a d‑block metal; the Stock system (and IUPAC practice for transition/post‑transition metals) indicates the metal oxidation state with a Roman numeral. In CdS the cadmium is +2, hence (II).
Note: British spelling “sulphide” may be seen instead of “sulfide.”
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