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	Categories: Nuclear chemistry Helion The helion is the nucleus of the helium-3 atom, one of the two stable isotopes of helium. The helion consists of two protons and one neutron. The nucleus of the helium-4 atom is called an alpha particle. According to CODATA, the mass of a helion particle is 5.006 412 14(86) × 10^-27 kg. External links 2002 CODATA: Helion mass. Categories: Nuclear chemistry

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