( ( a ( carbon atom ) ) ( ( has ( ( ( ( ( ( six protons ) , ) ( six neutrons ) ) , ) and ) ( six electrons ) ) ) ; ) )
(ROOT (S (NP (DT a) (NN carbon) (NN atom)) (VP (VBZ has) (NP (NP (CD six) (NNS protons)) (, ,) (NP (CD six) (NNS neutrons)) (, ,) (CC and) (NP (CD six) (NNS electrons)))) (: ;)))
a carbon atom has six protons, six neutrons, and six electrons;
(ROOT (S (NP (DT All) (NN carbon) (NNS atoms)) (VP (VBP have) (NP (CD six) (NNS protons))) (. .)))