In the physical sciences, subatomic particles are particles much smaller than atoms. There are two types of subatomic particles: elementary particles, which according to current theories are not made of other particles; and composite particles. Particle physics and nuclear physics study these particles and how they interact. In particle physics, t...
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any of various self-contained units of matter or energy that are the fundamental constituents of all matter. Subatomic particles include electrons, ... [38 related articles]
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http://www.britannica.com/eb/a-z/s/177
Any particle that is small compared to the size of the atom.
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In physics, a particle that is smaller than an atom. Such particles may be indivisible elementary particles, such as the electron and quark, or they may be composites, such as the proton, neutron, and alpha particle. See also particle physics
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Any particle that is small compared to the size of the atom
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