( ( Ionic bonds ) ( ( form ( between ( ( metals and ) nonmetals ) ) ) . ) )
(ROOT (S (NP (JJ Ionic) (NNS bonds)) (VP (VBP form) (PP (IN between) (NP (NNS metals) (CC and) (NNS nonmetals)))) (. .)))
Ionic bonds form between metals and     nonmetals.
(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)))) (. .)))