Illustrated Glossary of Organic Chemistry

Electronegative: An element with high electronegativity (EN = 2.3 to 4.0). This EN range is somewhat arbitrary.


Pauling Electronegativity Values for the Elements
Fluorine (shown in red) is the most electronegative (least electropositive) element (EN = 4.0). Cesium and francium (shown in blue) are the least electronegative (most electropositive) elements (EN = 0.7).