Electronegativity, Named Structurally
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Electronegativity is an atom's tendency to attract shared electrons in a bond, related to but distinct from the unbonded-atom electron affinity covered earlier.
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Electronegativity, unlike electron affinity, is only meaningfully defined for an atom already bonded to another atom.
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This entry only names electronegativity structurally; its full periodic trend and role in bond polarity belong to Unit 6's bonding material.