The bonding in U/sub 2/ and Np/sub 2/ involves 5f-5f interactions, leading to the intuitive orbital energetic ordering sigma/sub g/ < ..pi../sub u/ < delta/sub g/ < phi/sub u/ < phi/sub g/ < delta/sub u/ < ..pi../sub g/ < sigma/sub u/. Further studies are necessary to ascertain the dependence of the 5f-5f bonding upon the bond lengths of the molecules and upon the inclusion of spin-orbit and other relativistic effects.