chemical bonding

Question

Choose the bond below that is most polar:

a) C-F

b) H-H

c) N-O

d) C-N

e)C-P

Answer 1

The most polar bond will be the one with the greatest difference in electronegativity.

Use a Pauling Electronegativity chart to help determine the difference in the values. To simplify your work, use the larger value - the smaller value

C-F ΔEN = 3.98 - 2.55 = 1.43

H-H = 2.20 - 2.20 = 0.00

N-O = 3.44 - 3.04 = 0.40

C-N = 3.04 - 2.55 = 0.49

C-P = 2.55 - 2.19 = 0.36

You can also estimate using the locations on the periodic table. Any element bonded to itself will be non-polar. The further apart the elements are, the more polar they usually are. Fluorine is the most electronegative element by a lot, so bonds with fluorine are usually very polar.