Electronegativity and molecular polarity are central to understanding chemical bonding. By combining periodic trends with molecular geometry, you can predict whether a molecule is polar or nonpolar.

Lord Hunt of Chesterton, who has died aged 84, was director-general of the Meteorological Office from 1992 to 1997; ...

Uncover 25 alarming patterns in nature that signal disaster. From strange animal behavior to silent forests, learn how to ...