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| fundamental particle |
an elementary particle. |
| meson |
any of a group of elementary particles that react strongly with other particles, and that have a mass between that of the electron and that of the proton. |
| neutron |
an elementary particle having no charge, spin of one-half, and mass approximately equal to a proton, present in the nucleus of all atoms except the common isotope of hydrogen. |
| photon |
the fundamental unit of electromagnetic energy with zero mass, no electrical charge, and a spin of one, usu. regarded as an elementary particle. |
| positron |
in physics, an elementary particle equal to an electron in mass, spin, and magnitude of charge, but whose charge is positive. |
| proton |
an elementary particle of matter in the nucleus of all atoms, having a positive electrical charge. |
| quantum |
a discrete and irreducible unit of measurement, such as the spin of an elementary particle. [1/3 definitions] |
| quark |
any of several elementary particles believed to be components of protons, neutrons, and related particles. |
| weak interaction |
a weak force between elementary particles that is responsible for beta decay, neutrino absorption and emission, and some particle decay. (Cf. strong interaction.) |
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