( ( ( The ( atomic masses ) ) ( in ( the ( periodic chart ) ) ) ) ( ( are ( based ( on ( carbon ( having ( ( 12 ( nuclear residents ) ) ( -LRB- ( ( ( ( 6 protons ) and ) ( 6 neutrons ) ) -RRB- ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (JJ atomic) (NNS masses)) (PP (IN in) (NP (DT the) (JJ periodic) (NN chart)))) (VP (VBP are) (VP (VBN based) (PP (IN on) (NP (NP (NN carbon)) (VP (VBG having) (NP (NP (CD 12) (JJ nuclear) (NNS residents)) (PRN (-LRB- -LRB-) (NP (NP (CD 6) (NNS protons)) (CC and) (NP (CD 6) (NNS neutrons))) (-RRB- -RRB-)))))))) (. .)))
The atomic masses in the periodic chart are based on carbon having 12 nuclear residents (6 protons and 6 neutrons).
(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.