( ( ( Use ( ( the ( correct combination ) ) ( of ions ) ) ) ( to ( ( produce ( a compound ) ) ( with ( ( a ( net charge ) ) ( of zero ) ) ) ) ) ) . )
(ROOT (S (VP (VB Use) (NP (NP (DT the) (JJ correct) (NN combination)) (PP (IN of) (NP (NNS ions)))) (S (VP (TO to) (VP (VB produce) (NP (DT a) (NN compound)) (PP (IN with) (NP (NP (DT a) (JJ net) (NN charge)) (PP (IN of) (NP (CD zero))))))))) (. .)))
Use the correct combination of ions to produce a compound with a net charge of zero.
(ROOT (S (NP (JJ Iconic) (NNS compounds)) (VP (VBP have) (NP (DT a) (JJ net) (JJ neutral) (NN charge))) (. .)))