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Elements, Atoms, and Molecules. For a more advanced list of resources on atoms, elements and compounds. Elements are substances that cannot be separated into simpler substances. Salt is made up of the elements sodium and chloride. Water is made up of the elements hydrogen and oxygen. The smallest particles of matter are called atoms.
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.