Which is correct statement in case of Hund's rule ?

Options

A. It states that if more than one atomic orbital of the same energy is available, electrons will occupy different atomic orbitals with parallel spins, as far as possible, int eh configuration of lowest energy.
B. Total energy of a many electron atom with more than one electron occupying a set ofdegenerate orbitals is lowest, if as far as possible, electrons occupy different atomic orbitals and have parallel spins
C. Hunds rule forbid any configuration that does not violate the Pauli's exclusion prnciple
D. Hund's rule simply tells us which of the possible configuration is lowest in energy and other configurations are those of excited states, higher in energy than the ground state

Answer

A, B, D