( ( ( the atom ) ( of carbon ) ) ( ( ( ( has ( ( ( six protons ) and ) ( six neutrons ) ) ) , ) ( and ( so on ) ) ) . ) )
(ROOT (S (NP (NP (DT the) (NN atom)) (PP (IN of) (NP (NN carbon)))) (VP (VBZ has) (NP (NP (CD six) (NNS protons)) (CC and) (NP (CD six) (NNS neutrons))) (, ,) (ADVP (CC and) (RB so) (IN on))) (. .)))
the atom of carbon has six protons and six neutrons, and so on.
(ROOT (S (NP (NNP Carbon) (NNS atoms)) (VP (VBP have) (NP (NP (CD six) (NNS neutrons)) (CONJP (RB as) (RB well) (IN as)) (NP (CD six) (NNS protons)))) (. .)))