Isotopes are forms of an element with varying numbers of neutrons while maintaining the same number of protons. They are identified by the sum of protons and neutrons present.
Isotopes are various forms of an element that have the same number of protons but a different number of neutrons. For example, hydrogen isotopes have neutrons equal to 0, 1, and 2, respectively. Isotopes are defined first by their element and then by the sum of the protons and neutrons present.
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