( ( ( 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 (NP (DT A) (NN carbon) (NN atom)) (PP (IN with) (NP (NP (CD 6) (NNS protons)) (CC and) (NP (CD 8) (NNS neutrons))))) (VP (VBZ is) (ADVP (RBR more) (RB specifically)) (VP (VBN known) (PP (IN as) (NP (NN carbon) (CD 14))))) (. .)))
A carbon atom with 6 protons and 8 neutrons is more specifically known as carbon 14.