Question

Given the following information about electronegativity, which binary compound would form covelant bonds with the greatest polarity?

Element Electronegativity
H 2.1
Li 1.0
S 2.5
Al 1.5
F 4.0
Cl 3.0
A. HCl
B. LiF
C. H2S
D. AlH3

Answer 1

I think Bob Pursley answered this for you earlier. My answer is slightly different; i.e., subtract the electronegativity of each element. The difference is a measure of the polarity of the bond. For H2S, for example, 2.5- 2.1 = 0.4.
For AlH3 2.1 = 1.5 = 0.6
From these data, AlH3 is slightly more polar than H2S.
A value of zero is pure covalent which is what you get for H2, N2, Cl2, etc. A value of approximately 1.8 is 50% ionic/50% covalent character in the bond.

Answer 2

it’s A

Answer 3

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