quantum number(redirected from Q number)
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Any of a set of real numbers assigned to a physical system that individually characterize the properties and collectively specify the state of a particle or of the system.
(Atomic Physics) physics one of a set of integers or half-integers characterizing the energy states of a particle or system of particles. A function of the number multiplied by a fixed quantity gives the observed value of some specified physical quantity possessed by the system
any integer or half of an odd integer that distinguishes one of the discrete states of a quantum-mechanical system.