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When looking at an electron configuration, such as Chromium [Ar] 3d^5 4s^1, would the valence electrons be considered all the electrons in the 3d and 4s state? Or would the valence electrons be the ones in the 3d state?
You would have to include both the 4s orbital and 3d orbital in your count for valance electrons. Valance electrons determine the amount of bonds that is possible for the atom so since you have empty orbitals, they count towards your valance electron count.
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