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Electronegativity Electronegativity is a measure of how easily an atom can accept an electron to form a negative ion. The element with the highest electronegativity is fluorine. The lowest is cesium. Nonmetals have high electronegativity. Metals have low electronegativity. All other things being equal we expect that: Electronegativity increases left to right across a row Electronegativity decreases as you go down a column.

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