# electronegativity and how it relates to bond strength

my question is, if the strength of the bond between two atoms increases as the difference in electronegativity increases as well.

so say, a H-F bond would be stronger than a O-H bond.

I'm a little confused because I know that acidity increases from left to right across the periodic table. So H-F is a stronger acid than H-CH3. Wouldn't this mean that H-F has weaker bonds than H-CH3?

• No it doesn't, those two things are independent. H-F bond is stronger but it's only one of factors influencing acidity. – Mithoron Oct 26 '15 at 18:01

First off, you're comparing an ionically bonded $$\ce{HF}$$ with a covalently bonded $$\ce{CH4}$$. HF is a stronger acid than $$\ce{CH4}$$ because its able to furnish out $$\ce{H+}$$ ions due to its ionic bonding.
So I think your question boils down to: Why is ionic bonding in $$\ce{HX}$$ (X=Halogen) stronger than covalent bonding?