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| the electric or magnetic force that acts between oppositely charged bodies, tending to draw them together |
| any two masses attract each other with a force equal to a constant, multiplied by the product of the two masses, divided by the square of the distance between them |
| Pauli exclusion principle | |
| —n | |
| physics Sometimes shortened to: exclusion principle the principle that two identical fermions cannot occupy the same quantum state in a body such as an atom | |
| Pauli exclusion principle (pô'lē, pou'-) Pronunciation Key
The principle that two fermions of a given type, such as electrons, protons, or neutrons, cannot occupy the same quantum state. It does not apply to bosons. This principle plays a key role in the electron orbital structure of atoms, since it prevents more than two electrons from occupying any given orbital (two are allowed, since they may have opposite spin, and thus be in different quantum states). See also orbital, degeneracy pressure. |