- an electron of an atom, located in the outermost shell (valence shell) of the atom, that can be transferred to or shared with another atom.
Origin of valence electron
First recorded in 1925–30
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
- An electron in one of the outer shells of an atom that can participate in forming chemical bonds with other atoms.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.