Question

(c)
name is, formula is

Explanation:

• For the name: In chemical nomenclature, when naming a compound with a central atom (here \(P\)) and other atoms (\(Cl\)), we use the prefix for the number of non - central atoms. There are 5 \(Cl\) atoms. The prefix for 5 is "penta -", and the non - central atom is chlorine (we use the root "chlor" and add "-ide" for binary compounds). The central atom is phosphorus. So the name is phosphorus pentachloride.
• For the formula: The central atom is \(P\) (phosphorus) and there are 5 \(Cl\) (chlorine) atoms. In a chemical formula, we write the symbol of the central atom first followed by the symbol of the other atom with a subscript indicating the number of that atom. So the formula is \(PCl_{5}\).

Answer:

Name is phosphorus pentachloride, formula is \(PCl_{5}\)