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Sodium chloride(NaCl) is not a mixture. It is a compound. A compound is defined as a substance which consists of two or more atoms of elements chemically bound together. A mixture on the other hand is defined as a combination of two or more substances which are not chemically reactive with each other and can be separated easily.

Thus from the definitions, given, sodium chloride is a compound because it consists of one atom of sodium chemically bound to one atom of chlorine. It is commonly known as table salt and it only becomes a mixture when added to water or any other substance it cannot react with