( ( Distinguish ( among ( atoms ( , ( molecules ( , ( ions ( , ( and ( ionic compounds ) ) ) ) ) ) ) ) ) ) . )
(ROOT (S (VP (VB Distinguish) (PP (IN among) (NP (NNS atoms) (, ,) (NNS molecules) (, ,) (NNS ions) (, ,) (CC and) (NN ionic) (NNS compounds)))) (. .)))
Distinguish among atoms, molecules, ions, and ionic compounds.
(ROOT (S (NP (NP (JJ Ionic) (NN compound) (NNS atoms)) (PP (IN of) (NP (JJ various) (NNS elements)))) (VP (VBP gain) (CC or) (VBP lose) (NP (NNS electrons) (S (VP (TO to) (VP (VB produce) (NP (NNS ions))))))) (. .)))