Is there any differences in m.p./b.p. between 35Cl2 and 37Cl2?
In general, van der Waals' forces between the molecules increase with increasing molecular mass.
But, in the case of isotopes, I don't know whether it is true or not.
As both 35Cl2 and 37Cl2 have the same number of electron, the fluctuation in symmetry of charge cloud will be almost the same, resulting similar strength of instantaneous dipole- induced dipole atrraction. Therefore, I think they will have the same m.p./ b.p.
But this contradicts with that van der Waals' forces between the molecules increase with increasing molecular mass.
Can anybody help?