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The halogens (F, Cl, Br etc.) are one electron short of a valence shell octet, and are among the most reactive of the elements (they are colored red in this periodic table). In their chemical reactions halogen atoms achieve a valence shell octet by capturing or borrowing the eighth electron from another atom or molecule.
Re: Valence electron question. Permalink Submitted by kingchemist on Thu, 2009-10-08 15:38. Valence electrons are the outermost electrons in an atom/ion. The atom Ne has an electron arrangement of 2,8 so this has 8 valency electrons. This is a stable arrangement and atoms like Ne do not join to other elements. Is the example Ne 2+? If it is, it will have the arrangement 2,6 so would have 6 valence electrons