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Answer for the clue "(chemistry) the tendency of an atom or radical to attract electrons in the formation of an ionic bond ", 17 letters:
electronegativity

Word definitions for electronegativity in dictionaries

WordNet Word definitions in WordNet
n. (chemistry) the tendency of an atom or radical to attract electrons in the formation of an ionic bond [syn: negativity ]

Wiktionary Word definitions in Wiktionary
n. the tendency, or a measure of the ability, of an atom or molecule to attract electrons and thus form bonds

Wikipedia Word definitions in Wikipedia
Electronegativity , symbol χ , is a chemical property that describes the tendency of an atom or a functional group to attract electrons (or electron density ) towards itself. An atom's electronegativity is affected by both its atomic number and the distance ...