valence band

World English Dictionary
valence band
 
n
See energy band

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
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
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