which bond is most polar? C-Si ,O-Cl ,I-Br , As-Cl?

2017-07-25 8:33 am

回答 (2)

2017-07-25 2:30 pm
Data of electronegativity are based on the following webpage :
https://en.wikipedia.org/wiki/Electronegativities_of_the_elements_(data_page)

Electronegativities :
C = 2.55, Si = 1.90, O = 3.44, Cl = 3.16, I = 2.66, Br = 2.96, As = 2.18

Difference in electronegativity between C and Si = 2.55 - 1.90 = 0.65
Difference in electronegativity between O and Cl = 3.44 - 3.16 = 0.28
Difference in electronegativity between I and Br = 2.96 - 2.66 = 0.30
Difference in electronegativity between As and Cl = 3.16 - 2.18 = 0.98 (the greatest)

The greater the difference in electronegativity between two elements, the more polar the bond that formed by the atoms of these two elements is.
Hence, As-Cl bond is the most polar.
2017-07-25 12:13 pm
The ionic character (polarity) of an
AX bond involves determining the electronegativity difference ΔEN
given by χX - χA where χX and χA are the electronegativities of X and A.
http://en.wikipedia.org/wiki/Electronegativity
The easiest way is then to use a graph of the % ionic character vs. ΔEN to get % ionic character.
I find this one (although old Pauling χ) the best:
http://www.avogadro.co.uk/structure/bondnature.htm
Just eyeballing it I would say As-Cl is the most polar.


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