Theoretical works on radiative transitions produced in thermal collisions of atoms of groups 2A, 12 of the
periodic table with atoms of inert gases in the normal state as well as in nonsymmetrical collisions of inert gas
atoms are discussed in the review. Such collisions are accompanied by either the decay or the population of the
lower metastable state 3P2. The discussion has been carried out within the framework of analytical approaches
based on the Fermi pseudopotential method and semiempirical method.