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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 |
| the atomic number or neutron number of an exceptionally stable nuclide |
correspondence principle
philosophical guideline for the selection of new theories in physical science, requiring that they explain all the phenomena for which a preceding theory was valid. Formulated in 1923 by the Danish physicist Niels Bohr, this principle is a distillation of the thought that had led him in the development of his atomic theory, an early form of quantum mechanics.
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