( ( Proton ( A ( hydrogen atom ) ) ) ( ( contains ( ( ( one proton ) and ) ( one electron ) ) ) . ) )
(ROOT (S (NP (NP (NNP Proton)) (NP (DT A) (NN hydrogen) (NN atom))) (VP (VBZ contains) (NP (NP (CD one) (NN proton)) (CC and) (NP (CD one) (NN electron)))) (. .)))
Proton A hydrogen atom contains 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))))) (. .)))