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Helium-3 isotope (moon)

Helium-3 (3 He, tralphium, see also helion) is a light, non-radioactive isotope of helium with two protons and one neutron (common helium having two protons and two neutrons). Other than protium (ordinary hydrogen ), helium-3 is the only stable isotope of any element with more protons than neutrons .
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