How many isotopes of hydrogen are there?
Quick Answer
Hydrogen has three main isotopes: protium, deuterium, and tritium. Only protium is stable in ordinary nature in any significant amount.
The Full Story
Hydrogen has three widely recognized isotopes: protium, deuterium, and tritium. Protium has one proton and no neutrons, deuterium has one neutron, and tritium has two neutrons and is radioactive. Deuterium occurs naturally in small amounts and is used in chemistry and nuclear research. Tritium is produced in nuclear reactions and has a half-life of about 12.3 years. Because hydrogen is the lightest element, these isotope differences can significantly affect physical properties, especially in water and chemical reactions.
Key Facts
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"Three hydrogens, three very different behaviors"
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