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

Question

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

The trick here is to use your electronegativeity to determine which are covalent.

LiF, or instance, is ionic

You figure the rest based on difference in electronegativity.

Hint: are any Gaseous? Those are probbbly covalent. If three are colvlent, and two are gases, one solid, look closely at the solid.

Answer 2

Thank doesn't help. I posted the question because I don't understand how to compare the electronegativity when there are molecules like AlH3.