Helium-3 (3He see also helion) is a light, stable isotope of helium with two protons and one neutron (in contrast to the more common isotope, helium-4, which has two protons and two neutrons). Helium-3 and hydrogen-1 are the only stable nuclides with more protons than neutrons.
Helium-3 (3He see also helion) is a light, stable isotope of helium with two protons and one neutron (in contrast to the more common isotope, helium-4, which has two protons and two neutrons). Helium-3 and hydrogen-1 are the only stable nuclides with more protons than neutrons.
Source: Wikipedia "Helium-3" · CC BY-SA 4.0
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