Isotopes

Isotopes are atoms of the same element that have different numbers of neutrons but the same number of protons and electrons. The difference in the number of neutrons between the various isotopes of an element means that the various isotopes have different masses. The superscript number to the left of the element abbreviation indicates the number of protons plus neutrons in the isotope. For example, among the hydrogen isotopes, deuterium (denoted as 2H or D) has one neutron and one proton. This is approximately twice the mass of protium (1H), whereas tritium (3H) has approximately three times the mass of protium

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