( ( ( ion -- ) ( ( an ( atom ( or ( small molecule ) ) ) ) ( which ( carries ( a ( ( ( positive or ) negative ) charge ) ) ) ) ) ) . )
(ROOT (NP (NP (NN ion)) (: --) (NP (NP (DT an) (NN atom) (CC or) (JJ small) (NN molecule)) (SBAR (WHNP (WDT which)) (S (VP (VBZ carries) (NP (DT a) (ADJP (JJ positive) (CC or) (JJ negative)) (NN charge)))))) (. .)))
ion -- an atom or small molecule which carries a positive or negative charge.
(ROOT (S (NP (DT An) (NN ion)) (VP (VBZ is) (NP (NP (DT an) (NN atom) (CC or) (NN group)) (PP (IN of) (NP (NP (VBN bonded) (NNS atoms)) (SBAR (WHNP (WDT that)) (S (VP (VBZ has) (NP (DT a) (ADJP (JJ positive) (CC or) (JJ negative)) (NN charge))))))))) (. .)))