Ionic Bond Strength: LiF vs K20

[Qaztgbe]

What are the factors that determine the strength of an Ionic bond?
Taking the example of LiF and K20, why does LiF have a stronger bond strength?

 

[Borek]

Think about coulomb forces.

 

[Qaztgbe]

Yeah... not really working for me.
I need the answer.

The question I had was :

Please arrange the bonds in order of the increasing ionic character of the molecules (without looking at the electronegativity table) -
LiF, K2O, SO2, N2 and ClF3

Of which the answer was -
N2<SO2<ClF3<LiF<K2O

I can't understand as to why K2O has a stronger ionic character than LiF.

 

[Borek]

So what is the question? In the subject you mentioned ionic bond strength, now you ask about stronger ionic character. These are two different things.

 

[Qaztgbe]

Nevermind, understood the problem I was having.
Thanks anyway.

 

[Saitama]

Also you can think in terms of lattice energy and polarising power or polarisability. :)

 

[Qaztgbe]

Will do. Thanks :)