( ( Picture ( ( a ( hydrogen atom ) ) ( with ( ( ( one proton ) and ) ( one electron ) ) ) ) ) . )
(ROOT (NP (NP (NNP Picture)) (NP (NP (DT a) (NN hydrogen) (NN atom)) (PP (IN with) (NP (NP (CD one) (NN proton)) (CC and) (NP (CD one) (NN electron))))) (. .)))
Picture a hydrogen atom with one proton and one electron.
(ROOT (S (NP (EX There)) (VP (VBP are) (NP (NP (CD one) (NNS electrons)) (PP (IN in) (NP (DT the) (NN hydrogen) (NN atom))))) (. .)))