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valence shell
va·lence shell (plural va·lence shells)


noun 
Definition:
 
outer electron shell of atom: the outer electron shell of an atom, containing one or more electrons valence electrons that are available to form bonds with other atoms to create molecules
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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