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When matter contains only one species of atom (same number of protons in nucleus of each), it is called an element.

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Each element is made of atoms that are essentially the same, with the same number of protons in the atomic nucleus. An element may have stable forms with varying numbers of neutrons, and these are called isotopes.

Elements are classified as pure substances, a type of matter that cannot be chemically separated into other components. Matter that consists of only one type of atom (for instance iron, Fe) is called an element. Matter that consists of two or more types of atoms, chemically combined (for instance table salt NaCl, sodium and chlorine combined) is called a compound

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12y ago

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