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Hydrogen has three naturally occurring isotopes:

Protium or 1H has only a single proton in its nucleus (no neutrons) and is by far the most common isotope (~99.9885% of all hydrogen atoms are protium)

Deuterium or 2H has one proton and one neutron in its nucleus and is the second most common isotope (~0.0115% of all hydrogen atoms are deuterium)

Tritium or 3H contains one proton and two neutrons in its nucleus and occurs in very small trace amounts in nature (less than 0.00001%)

4H with 3 neutrons, 5H with 4 neutrons, 6H with 5 neutrons and 7H with 6 neutrons have been produced artificially in the lab but they all have half-life of less than 10-21 seconds.

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13y ago

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