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Protium, deuterium, and tritium are all isotopes of hydrogen (H).

As far as their masses:
Tritium>Deuterium>Protium

In their nuclei:
Protium has 1 proton and 0 neutrons
Deuterium has 1 proton and 1 neutron
Tritium has 1 proton and 2 neutrons
So yes, Deuterium is heavier than tritium.
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11y ago

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