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Hydrogen facts

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Which of the hydrogen isotopes is radioactive?
Tritium. The two lightest isotopes of hydrogen are stable (protium and deuterium). The tritium is radioactive and unstable, with a half-life of 12.32 years. It is the only radioactive isotope of hydrogen which naturally occurs on Earth (although it is extremely rare).
 Paweł Kołodziejczyk
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wikipedia → Tritium
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names facts
How many hydrogen isotopes occur naturally on the Earth?
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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wikipedia → Category:Isotopes of hydrogen
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isotopes facts
Which of the following is not a hydrogen isotope?
Iridium. Protium, deuterium and tritium are hydrogen isotope varieties. Iridium is a chemical element.
 globalquiz.org
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elements facts
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