Question

What intermolecular force causes Kr, with an atomic mass of 84, to have a lower boiling point than Cl2, with a mass of 71?

Answer 1

I am a bit lost because neither molecules are polar, so they should both only have London Dispersment forces, right?

Answer 2

And when considering only LDFs, you generally go by atomic weight...

Answer 3

well, think about it, chlorine is a diatom, which means you have bonding Cl-Cl