Valence electrons are the electrons that are in the most outer orbital.
Valence electrons are in the outer most electron shell of an atom. For example, oxygen has a total of 8 electrons, two fill the first shell, and 6 remain in the outer shell. If you move one atom to the left (Nitrogen) you would have 5 valence electrons and one to the right (Fluorine) you would have 7 valence electrons.
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