Definition of quantum number
: any of a set of numbers that indicate the magnitude of various discrete quantities (such as electric charge) of a particle or system and that serve to define its state
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Recent Examples of quantum number from the Web
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Middle Sister prattled on about how an atom having six principal quantum numbers can yield several emission lines, or some such.
These example sentences are selected automatically from various online news sources to reflect current usage of the word 'quantum number.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.
First Known Use of quantum number
1902
Learn More about quantum number
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Britannica.com: Encyclopedia article about quantum number
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