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Part of the Mathematics glossary: 1) In chemistry and physics, an element is a substance that cannot be broken down into simpler components by any non-nuclear chemical reaction. An element is uniquely determined by the number of protons in the nuclei of its atoms. The number of protons in the nucleus of the atom of an element is known as the atomic number of that element. The number of electrons in the atom of a specific element can vary.
An isotope is a particular form of an element. The atoms of one isotope of an element differ from those of another isotope of the same element primarily in the number of neutrons in their nuclei. (They all have the same number for both protons and electrons.)