( ( Contents ( Atom It ) ) ( ( is ( natural ( to ( ( ( ( begin ( consideration ( of ( an ( atom structure ) ) ) ) ) ( with ( ( an atom ) ( of hydrogen ) ) ) ) , ) ( consisting ( of ( ( ( one proton ) and ) ( one electron ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Contents) (NNP Atom) (PRP It)) (VP (VBZ is) (ADJP (JJ natural) (S (VP (TO to) (VP (VB begin) (NP (NP (NN consideration)) (PP (IN of) (NP (DT an) (NN atom) (NN structure)))) (PP (IN with) (NP (NP (DT an) (NN atom)) (PP (IN of) (NP (NN hydrogen))))) (, ,) (S (VP (VBG consisting) (PP (IN of) (NP (NP (CD one) (NN proton)) (CC and) (NP (CD one) (NN electron))))))))))) (. .)))
Contents Atom It is natural to begin consideration of an atom structure with an atom of hydrogen, consisting of 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))))) (. .)))