( ( ( Study ( the rules ) ) ( for ( ( assigning ( oxidation numbers ) ) ( for ( atoms ( in ions ) ) ) ) ) ) . )
(ROOT (S (VP (VB Study) (NP (DT the) (NNS rules)) (PP (IN for) (S (VP (VBG assigning) (NP (NN oxidation) (NNS numbers)) (PP (IN for) (NP (NP (NNS atoms)) (PP (IN in) (NP (NNS ions))))))))) (. .)))
Study the rules for assigning oxidation numbers for atoms in ions.
(ROOT (S (NP (DT The) (NN octet) (NN rule)) (VP (VP (VBZ is) (NP (NP (DT a) (NN result)) (PP (IN of) (NP (NP (NNS trends)) (PP (IN in) (NP (NNS energies))))))) (CC and) (VP (VBZ is) (ADJP (JJ useful) (PP (IN in) (S (VP (VBG explaining) (SBAR (WHADVP (WRB why)) (S (NP (NNS atoms)) (VP (VBP form) (NP (DT the) (NNS ions)) (SBAR (IN that) (S (NP (PRP they)) (VP (VBP do))))))))))))) (. .)))