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valence band

noun
1.
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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valence band in Science
valence band  
The outermost electron shell of atoms in an insulator or semiconductor, in which the electrons are too tightly bound to the atom to carry electric current. Compare conduction band. See also bandgap.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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