Isotope

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Isotopes of a chemical element are atoms whose nuclei have different numbers of neutrons. The name, meaning at the same place, refers to the location on the same place of the periodic table. Having the same number of protons, they also have the same number of electrons, which makes their chemical properties almost identical.

Different isotopes of an element are created in stars, by bombardment by cosmic rays on earth, and by nuclear decay of other elements.