Helium-3 (He-3) is a light, stable isotope of helium with two protons and one neutron in its nucleus, giving it an atomic mass of approximately three atomic mass units. It is a rare isotope compared to the more common helium-4 (He-4), which has two protons and two neutrons.

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Helium-3 by Ciro Santilli 37 Updated 2025-07-16
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