( Ions ( ( Some atoms ) ( ( have ( the ( ability ( to ( ( ( gain or ) lose ) electrons ) ) ) ) ) . ) ) )
(ROOT (S (ADVP (RB Ions)) (NP (DT Some) (NNS atoms)) (VP (VBP have) (NP (DT the) (NN ability) (S (VP (TO to) (VP (VB gain) (CC or) (VB lose) (NP (NNS electrons))))))) (. .)))
Ions Some atoms have the ability to gain or lose electrons.
(ROOT (S (NP (JJ Monatomic) (NNS ions)) (VP (VBP form) (SBAR (WHADVP (WRB when)) (S (NP (DT a) (JJ single) (NN atom)) (VP (VBZ gains) (CC or) (VBZ loses) (NP (NNS electrons)))))) (. .)))