What is the difference of polar and non polar?

Polar covalent molecules have a defined axis (or defined axes) of partial positive and partial negative elements. The difference in all the electronegativities of each element should be between .4 and 1.7 inclusively. For example, H2O:



Non-polar covalent molecules do not have a defined axis of partial positive and partial negative elements. The difference in at least one of the electronegativities of at least 2 elements should be less than .4 exclusively. For example, CCl4:



Non-polar covalent molecules:
1.) Either have at least 1 bond between at least 2 elements as Non-polar covalent
2.) Do not have a defined axis (or axes) or partial positive and negative.


Polar covalent molecules, however, do.


Non-polar Covalent Bonds:
Difference of the electronegativities is < .4


Polar covalent bonds:
Difference of the electronegativities is >/= .4 and

Ionic Bonds:
Difference of the electronegativities is > 1.7