What are dispersion forces ?

What is dispersion ?

(A) Noble gas elements have very low melting and boiling points (R) The interatomic attractions in noble gas elements are weak dispersion forces.

The size of molecular chlorine is about 3.5A^@ . At what maximum intermolecular distance the dispersion forces operate?

Fog is a dispersion of

Arrange n-pentane, isopentane and neopentane in the descending order of dispersion forces.

In how many solids only london dispersion forces exist ? Dry ice, Ice, Solid I_(2) , Solid 'Xe', Rocksalt, 'He' gas

Define force . What are the basic forces in nature ?