What are the three isotopes of hydrogen?
Hydrogen has three isotopes: protium, deuterium, and tritium. Radioactive tritium is used in some self-glowing exit signs.
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Isotope Facts
Isotope facts and facts about isotopes, from the Random Facts shelf.
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How much natural uranium is uranium-235?
Only about 0.7% of natural uranium is uranium-235.
How long is uranium-238's half-life?
Uranium-238 has a half-life of about 4.5 billion years, about the age of Earth.