( ( Explain ( how ( ( each trend ) ( reflects ( ( the ( electron configuration ) ) ( of ( the elements ) ) ) ) ) ) ) . )
(ROOT (S (VP (VB Explain) (SBAR (WHADVP (WRB how)) (S (NP (DT each) (NN trend)) (VP (VBZ reflects) (NP (NP (DT the) (NN electron) (NN configuration)) (PP (IN of) (NP (DT the) (NNS elements)))))))) (. .)))
Explain how each trend reflects the electron configuration of the elements.
(ROOT (S (NP (NP (DT The) (JJ chemical) (NN behavior)) (PP (IN of) (NP (NNS elements)))) (VP (MD can) (ADVP (RB largely)) (VP (VB be) (VP (VBN explained) (PP (IN by) (NP (NN electron) (NNS configurations)))))) (. .)))