Definitions for valence electron
Random House Webster's College Dictionary
an electron of an atom, located in the outermost shell (va′lence shell`) of the atom, that can be transferred to or shared with another atom.
Origin of valence electron:
an electron in the outer shell of an atom which can combine with other atoms to form molecules
any of the electrons in the outermost shell of an atom; capable of forming bonds with other atoms
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