Note: Substance B has a medium molecular attraction while substance C has a low molecular attraction. If substances B and C are both in the gas phase and are at the same energy level, which if the two substances will need to have more energy transferred out in order to change to the liquid phase? Substance C or substance B?

What does hund's rule state? a. an orbital can contain two electrons only if the electrons have opposite spins. b. an orbital can contain two electrons only if all other orbitals at that sublevel are empty. c. an orbital can contain two electrons only if the electrons have different energy levels. d. an orbital can contain two electrons only if all other orbitals in that sublevel contain at least one electron.