Chemistry / Chem 0972 · Atom · ~20 seconds
Electronegativity's Periodic Trend
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Electronegativity rises across a period and falls down a group, tracking the same effective-nuclear-charge mechanism as ionization energy.
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Fluorine, top right of the trend, has the highest electronegativity of any element; francium, bottom left, has among the lowest.
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Electronegativity is a bonding tendency read from position, not a measured energy the way ionization energy is.