Polar covalent bonds

• Non polar molecules are formed when each atom has an equal pull on the bonding electrons. For example Cl2
• In most covalently bonded compounds, electrons are not shared equally and they are pulled towards one of the atoms (the one which has a greater pulling power)
• The bond is polarised and molecule becomes polar
• In H-F, fluorine pulls the bonding electrons more effectively because ot has it has a greater nuclear charge forming a molecule with a dipole (meaning 2 poles)