The atomic orbitals of two chlorine atoms combine to form the diatomic cl2 molecule. use the periodic table to determine the atomic orbitals that overlap to form the cl2 molecule and the symbol of the noble gas that has the same electron configuration as the electron configuration of each bonded chlorine atom. for example, the 2p atomic orbitals of fluorine atoms overlap to form the f2 molecule. the noble gas that has the same electron configuration as that of each bonded fluorine atom is ne. to enter the atomic orbitals that overlap and the corresponding noble gas, you would enter 2p, ne.