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| one of the units, as mass, length, time, or electric current, taken as a basis for a system of units in the sciences |
| pertaining to a process that occurs within an atom; noting a particle contained in an atom, such as electrons, protons, or neutrons |
| free electron | |
| —n | |
| any electron that is not attached to an ion, atom, or molecule and is free to move under the influence of an applied electric or magnetic field | |