Question

If 2 fermionic atoms form a molecule, will the molecule always behave as a boson?

Answer 1

2 fermionic atoms give a bosonic molecule. 2 bosonic atoms form a bosonic molecule. Is there a energy scale where these two molecules will behave differently? If yes, will it depend on the rovibrational level of the molecule? Does the bond length play a role?

A practical example would be 39K239K2 molecule vs 40K240K2 molecule.

39K239K2 -> Potassium 39 and 40K240K2 -> Potassium 40.

Answer 2

Yes molecules always behave as a boson