how to determine the molecule is polar or not

Asked by Tanima Saxena | 1st May, 2013, 01:04: PM

Expert Answer:

The very simple rule involves electronegativity difference between the bonded atoms. If the electronegativity of the two atoms has a difference of 0.3 or less, then the bond is non-polar. If the electronegativity difference is greater that 0.3 but less than 1.7, then the bond is polar. If the two values have a difference greater than 1.7, then the bond is ionic, which is just very very polar. 
 
 For example,in water molecule, the highly electronegative oxygen atom attracts electrons towards it, making the region around the oxygen more negative than the areas around the two hydrogen atoms. So, water is a polar molecule.

Answered by  | 1st May, 2013, 04:27: PM

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