Final answer:
A compound contains elements combined in a fixed ratio. Salt is a compound made of sodium and chlorine. Phosphorus, sulfur, oxygen, and Tin are elements, not compounds.
Explanation:
Compound: A compound is composed of two or more elements combined in a fixed ratio. It is a substance made up of different types of atoms bonded together.
In the case of the given substances, salt is a compound. It is made of sodium and chlorine atoms bonded together in a fixed ratio, known as sodium chloride (NaCl).
On the other hand, phosphorus, sulfur, oxygen, and T (presumably meaning an element like element symbol for Tin) are not compounds; they are elements, which are the simplest forms of chemical substances.
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