Question

the london (dispersion) forces are weakest for which of the following gases under the same conditions of temperature and pressure?
a h₂
b o₂
c xe
d f₂

Explanation:

London (dispersion) forces increase with the size of the electron - cloud of the molecule or atom. Larger atoms or molecules have more electrons and a greater polarizability, leading to stronger dispersion forces. Among the given options, $H_2$ has the fewest electrons and the smallest electron - cloud, so it has the weakest London dispersion forces.

Answer:

A. $H_2$