E2 Charged Carbon species 1 Anions Negatively charged ions with lone pairs of electrons are nucleophiles.The atom bearing the negative charge is the nucleophilic center 2 Cations Positively charged ions are electrophiles. The atom bearing the positivecharge is the electrophilic center. .carbocations:sp2(trigonal) geometry,planar,positive charge carbanions:sp3(tetrahedral) geometry,strong base,negative charge a Carbocation a Carbon Radical a CarbanionCollege E2、 Charged Carbon speciesof Science „1 Anions Negatively charged ions with lone pairs of electrons are nucleophiles. The atom bearing the negative charge is the nucleophilic center „2 Cations Positively charged ions are electrophiles. The atom bearing the positivecharge is the electrophilic center. •carbocations: sp2 (trigonal) geometry,planar, positive charge • carbanions: sp3 (tetrahedral) geometry, strong base, negative charge