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valence electron

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noun Chemistry.
  1. 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
valence-shell in Science

valence electron

  1. An electron in one of the outer shells of an atom that can participate in forming chemical bonds with other atoms.
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