Taking into account the auf bau principle and Hund's rule, determine which statement is false.-The 2s orbital should be occupied with electrons before the 3s orbital.-In a completely filled subshell, half of the electrons have "up" spin and half have "down" spin.-Electrons occupy the lowest-energy atomic orbitals before higher energy atomic orbitals.-Three electrons occupying the set of 2p orbitals all have the same spin.-Two electrons should be placed in a given orbital, with opposite spins, before any electrons are placed in other degenerate orbitals.

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