A sub-atomic particle, within the nucleus of an atom, which has unit mass and zero charge. A member of the baryon and hadron families of elementary particles. It was discovered by Chadwick in 1932.

The neutron consists of two down and one up quark.

Protons and neutrons comprise atomic nuclei and they are both classed as nucleons.

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neutron mass 1.67492716e-27 kgClip
neutron-muon mass ratio 8.89248478 Clip
neutron-tau mass ratio 0.528722 Clip
neutron-electron mass ratio 1838.6836550 Clip
neutron-proton mass ratio 1.00137841887 Clip
neutron molar mass 1.00866491578e-3 kgmol-1Clip
neutron Compton wavelength 1.319590898e-15 mClip
neutron magnetic moment -0.96623640e-26 JT-1Clip
neutron g-factor -3.82608545 Clip
neutron-electron magnetic moment ratio 1.04066882e-3 Clip
neutron-proton magnetic moment ratio -0.68497934 Clip
neutron gyromagnetic ratio 1.83247188e8 s-1T-1Clip
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Different isotopes of the same element are distinguished by having different numbers of neutrons in their nucleus.

See also: Antineutron, Atomic Particle, Chadwick, James, Electron, Exclusion Principle, Isotopes, Moderator, Nucleus, Particle Accelerator, Physical Constants, Prompt Neutrons, Proton.

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Subjects: Nuclear and Particle Physics