What is a chemical compound?

Chemical compound - a substance consisting of two or more elements, joined together. Each molecule of the compound is one and the same combination of atoms. Sodium chloride, for example, consists of 1 sodium atom connected to a chlorine atom. Properties of compounds differ from the properties of the elements included in their composition. Sodium, for example, is a mild metal that decomposes water with hydrogen, and chlorine is a thick green gas. Sodium chloride is an ordinary salt.

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