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The nitrogen atom has only 5 valence electrons and is therefore considered an electrophile.
en.wikipedia.org These similarities are due to similar structure in their outer shells of valence electrons.
en.wikipedia.org It is also known as "gram-molecule" or mole per unit of valence.
en.wikipedia.org In semiconductor optics, one typically excites transitions between a valence and a conduction band.
en.wikipedia.org This group investigated proton structure and discovered that proton spin was not carried by the valence quarks, which overturned the previous predictions.
en.wikipedia.org