What does the Pauli exclusion principle state? A. Electrons will be added to an atom at the lowest possible level or sublevel.
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 all other orbitals in that sublevel contain at least one electron.
D. Two electrons can occupy the same orbital only if they have opposite spins.
E. An orbital can contain two electrons only if all other orbitals at that sublevel are empty.