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Compounds. A compound is a substance formed when two or more elements are chemically joined. Water, salt, and sugar are examples of compounds. When the elements are joined, the atoms lose their individual properties and have different properties from the elements they are composed of. A chemical formula is used a quick way to show the composition of compounds.
Elements are composed of atoms, which are extremely small. All atoms of a given element have the same chemical properties and contain the same number of protons. Compounds are formed by the chemical combination of two or more different kinds of atoms. (Whole numbers only) Atoms are the units of chemical change.