( ( ( ( Atoms ( that ( have gained ) ) ) or ) ( loss electrons ) ) ( ( are ( called ions ) ) . ) )
(ROOT (S (NP (NP (NP (NNS Atoms)) (SBAR (WHNP (WDT that)) (S (VP (VBP have) (VP (VBN gained)))))) (CC or) (NP (NN loss) (NNS electrons))) (VP (VBP are) (VP (VBN called) (NP (NNS ions)))) (. .)))
Atoms that have gained or loss electrons are called ions .
(ROOT (S (SBAR (WHADVP (WRB When)) (S (NP (DT an) (NN atom)) (VP (VBZ gains) (CC or) (VBZ loses) (NP (DT an) (NN electron))))) (NP (PRP it)) (VP (VBZ becames) (NP (DT a) (PRN (-LRB- -LRB-) (NP (NN n)) (-RRB- -RRB-)) (NN ion))) (. .)))