Dispersion forces occur between non-polar molecules.
-They were named after the physicist Fritz London, as "London Forces". -They are caused by the uneven distribution of electrons in molecules next to each other, sometimes caused by collision.
It is the only force within noble gases. Without dispersion force, noble gases would not exist in liquid form.
However, this distribution is only TEMPORARY where the region that is more dense with electrons in the electron cloud in one molecule repels the electrons in the electron cloud of its neighboring molecules. The remainder is two temporary dipoles within each molecule.
Dispersion within CH4 molecules
This results in a weak attraction of the nucleus of one molecule for the electrons present in the molecules surrounding it. -Dispersion Forces occur between H2, Cl2,, CH4 and CO2 molecules.
Dispersion Force between Iodine molecules
Dispersion Forces become stronger as molecules are larger
because the larger they are, the greater the number of dispersed electrons are, and the greater the polarity will be.