( 4 ( ( ( ( Be ( able ( to ( explain ( why ( ( ( the ( energy levels ) ) ( in ( multielectron atoms ) ) ) ( ( differ ( from ( ( the levels ) ( in ( ( the ( hydrogen-like atom ) ) ( ( 5 Be ) able ) ) ) ) ) ) ( to state ) ) ) ) ) ) ) ) and ) ( apply ( ( ( ( ( ( the ( Pauli ( Exclusion Principle ) ) ) , ) ( ( Hund 's ) Rule ) ) , ) and ) ( the ( Aufbau Principle ) ) ) ) ) . ) )
(ROOT (S (LST (LS 4)) (VP (VP (VB Be) (ADJP (JJ able) (S (VP (TO to) (VP (VB explain) (SBAR (WHADVP (WRB why)) (S (NP (NP (DT the) (NN energy) (NNS levels)) (PP (IN in) (NP (NN multielectron) (NNS atoms)))) (VP (VBP differ) (PP (IN from) (NP (NP (DT the) (NNS levels)) (PP (IN in) (NP (NP (DT the) (JJ hydrogen-like) (NN atom)) (ADJP (NP (CD 5) (NNS Be)) (JJ able)))))) (PP (TO to) (NP (NN state))))))))))) (CC and) (VP (VB apply) (NP (NP (DT the) (NNP Pauli) (NNP Exclusion) (NNP Principle)) (, ,) (NP (NP (NNP Hund) (POS 's)) (NN Rule)) (, ,) (CC and) (NP (DT the) (NNP Aufbau) (NNP Principle))))) (. .)))
4 Be able to explain why the energy levels in multielectron atoms differ from the levels in the hydrogen-like atom 5 Be able to state and apply the Pauli Exclusion Principle, Hund's Rule, and the Aufbau Principle.
(ROOT (S (NP (NNP Aufbau) (NN principle)) (VP (VBZ gives) (NP (NP (DT the) (NN order)) (PP (IN of) (NP (NP (NN electron)) (VP (VBG filling) (PP (IN in) (NP (DT an) (NN atom)))))))) (. .)))
Aufbau principle gives the order of electron filling in an atom.