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quantum number
quan·tum num·ber (plural quan·tum num·bers)


noun 
Definition:
 
number expressing property of particle: any one of the set of integers or half integers that characterize the properties and energy states of an elementary particle or system
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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