explain why the electronegativity value of noble gases are zero while those of halogen are the highest each period
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because metallic character decreases along the period
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Electronegativity increases across a period, and decreases down a group. Therefore, fluorine has the highest electronegativity of all of the elements, indicated by its position on the periodic table. ... Fluorine is then isoelectronic with a noble gas (with eight valence electrons); all its outermost orbitals are filled.
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