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| | elementary particle - Hutchinson encyclopedia article about elementary particle |
 | | In physics, a subatomic particle that is not known to be made up of smaller particles, and so can be considered one of the fundamental units of matter. |
 | | Quarks, of which there are 12 types (up, down, charm, strange, top, and bottom, plus the antiparticles of each), combine in groups of three to produce heavy particles called baryons, and in groups of two to produce intermediate-mass particles called mesons. |
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