For Valence Electrons we have terms and definitions in 2 topics. The topics are Atmospheric Chemistry and Chemistry.

The outermost electrons of an atom that are in the orbitals of highest principal quantum number of all electrons in the atom and don't fill that orbital completely. [Physics Chemistry; v100; 5715-20; 1986.] [Organic Chemistry; 2nd ed; 48-50; 1997
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The outermost shell of electrons in an atom or ion.
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