Quantum-number meaning

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.
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A number expressing the magnitude of a physical quantity in units appropriate to a given quantum mechanical system.
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Any of a set of numbers that together fully determine the state of a quantum mechanical system by quantifying its individual properties. For example, four quantum numbers are used to specify the quantum state of an electron orbiting the nucleus of an atom: one characterizes its basic orbital energy level (principal or first quantum number), one the shape of its orbit (its azimuthal, orbital or second quantum number), one the orientation of its orbit relative to other orbits (magnetic or third quantum number), and one its spin (spin or fourth quantum number).
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(quantum mechanics) One of certain integers or half-integers that specify the state of a quantum mechanical system (such as an electron in an atom).
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