( ( ( ( Ionic bond ) - ) ( occurs ( when ( ( a ( metal cation ) ) ( is ( attracted ( to ( a ( nonmetal anion ) ) ) ) ) ) ) ) ) . )
(ROOT (X (NP (JJ Ionic) (NN bond)) (: -) (FRAG (VP (VBZ occurs) (SBAR (WHADVP (WRB when)) (S (NP (DT a) (NN metal) (NN cation)) (VP (VBZ is) (VP (VBN attracted) (PP (TO to) (NP (DT a) (JJ nonmetal) (NN anion))))))))) (. .)))
Ionic bond- occurs when a metal cation is attracted to a nonmetal anion.
(ROOT (S (NP (NP (JJ Ionic) (NNS bonds)) (PP (IN between) (NP (CD two) (NNS atoms)))) (VP (VBP require) (NP (NP (CD one) (NN metal)) (CC and) (NP (CD one) (NN nonmetal)))) (. .)))