Polarity in Bonds vs Polarity in Molecules Std 2

Lecture Notes

Polarity - Bonds between 2 atoms

Polar	Non-polar
if 2 atoms are different	if atoms are same

Molecular Polarity

Shape	Polar	Non-polar
linear (only 2 atoms)	if atoms are different	if atoms are the same
linear (3 atoms)	outside atoms different	outside atoms same
bent	always	never ( except O3 )
trigonal planar	outside atoms at least two kinds	outside atoms are all the same
trigonal pyramidal	always polar	never
tetrahedral	outside atoms at least two different kinds	outside atoms all the same