Bond Polarity and Electronegativity ■ Electronegativity (EN):intrinsic ability of an atom to attract the shared electrons in a covalent bond Differences in EN produce bond polarity Metals on left side of periodic table attract electrons weakly,lower EN Halogens and other reactive nonmetals on right side of periodic table attract electrons strongly,higher electronegativities F is most electronegative(EN 4.0),Cs is least(EN =0.7） ■EN of C=2.5Bond Polarity and Electronegativity „ Electronegativity (EN): intrinsic ability of an atom to attract the shared electrons in a covalent bond „ Differences in EN produce bond polarity „ Metals on left side of periodic table attract electrons weakly, lower EN „ Halogens and other reactive nonmetals on right side of periodic table attract electrons strongly, higher electronegativities „ F is most electronegative (EN = 4.0), Cs is least (EN = 0.7) „ EN of C = 2.5