How many neutrons are in protium, deuterium, and tritium?
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The number of neutrons in the isotopes of hydrogen varies based on their mass numbers:
- Protium: The nucleus of this isotope consists of only one proton and contains zero neutrons.12
- Deuterium: Also known as heavy hydrogen, its nucleus consists of one proton and one neutron.31
- Tritium: The nucleus of this isotope consists of one proton and two neutrons.451