# Why NCl3 is dipole-dipole in intermolecular force?

mfb
Mentor
3.0 is a rounded value, they are not exactly the same. The small difference is still more important than the weaker van-der-Waals forces.
This post suggests a notable difference between the electronegativity.

3.0 is a rounded value, they are not exactly the same. The small difference is still more important than the weaker van-der-Waals forces.
This post suggests a notable difference between the electronegativity.
But, according to https://en.wikipedia.org/wiki/Chemical_polarity ,
• Polar bonds occur when the difference in electronegativity between the two atoms is between 0.4 and 1.7
In that post you suggested, the electronegativity difference is just 0.2 , still not enough to perform a polar bond..

mfb
Mentor
There is no sharp line dividing polar and nonpolar. Some bonds are more polar than others.
In the same way, there is no sharp line dividing polar and ionic bonds.

There is no sharp line dividing polar and nonpolar. Some bonds are more polar than others.
In the same way, there is no sharp line dividing polar and ionic bonds.
If there is no sharp line dividing polar and non-polar, how to determine if such bond is polar?
By memorizing only??

DrDu