How many hydrogen isotopes occur naturally on the Earth?

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Three isotopes of hydrogen occur naturally on the Earth: the most frequent protium (1H), deuterium (2H) and tritium (3H). Other isotopes of hydrogen (4H-7H) were created in laboratories and are highly unstable.
Paweł Kołodziejczyk
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Very interesting!
reach: rather globalchemistryelementshydrogenisotopesnamesphysics

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