Hydrogen exists as three isotopes.These isotopes differ by the number of ________ contained in the atom.

Name: Hydrogen exists as three isotopes.These isotopes differ by the number of ________ contained in the atom.
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Isotopes are atoms of the same element that have the same number of protons but a different number of neutrons. In the case of hydrogen, the three isotopes are protium, deuterium, and tritium, and they differ by the number of neutrons they contain.

Hydrogen Exists as Three Isotopes