( Lead ( ( ( has ( ( ( an ( atomic number ) ) ( -LRB- ( ( ( the number ) ( of ( protons ( in ( the nucleus ) ) ) ) ) -RRB- ) ) ) ( of ( ( ( ( ( ( 82 and ) four ) ( stable isotopes ) ) ( with ( ( atomic masses ) ( -LRB- ( ( ( i.e. , ) ( ( the number ) ( of ( ( ( protons and ) neutrons ) ( in ( the nucleus ) ) ) ) ) ) -RRB- ) ) ) ) ) ( of 204 ) ) , ) ) ) ) ( 206 ( , ( ( 207 and ) 208 ) ) ) ) . ) )
(ROOT (S (NP (NNP Lead)) (VP (VBZ has) (NP (NP (NP (DT an) (JJ atomic) (NN number)) (PRN (-LRB- -LRB-) (NP (NP (DT the) (NN number)) (PP (IN of) (NP (NP (NNS protons)) (PP (IN in) (NP (DT the) (NN nucleus)))))) (-RRB- -RRB-))) (PP (IN of) (NP (NP (QP (CD 82) (CC and) (CD four)) (JJ stable) (NNS isotopes)) (PP (IN with) (NP (NP (JJ atomic) (NNS masses)) (PRN (-LRB- -LRB-) (NP (NP (NNP i.e.)) (, ,) (NP (NP (DT the) (NN number)) (PP (IN of) (NP (NP (NNS protons) (CC and) (NNS neutrons)) (PP (IN in) (NP (DT the) (NN nucleus))))))) (-RRB- -RRB-)))) (PP (IN of) (NP (CD 204))) (, ,)))) (NP (CD 206) (, ,) (CD 207) (CC and) (CD 208))) (. .)))
Lead has an atomic number (the number of protons in the nucleus) of 82 and four stable isotopes with atomic masses (i.e., the number of protons and neutrons in the nucleus) of 204, 206, 207 and 208.
(ROOT (S (NP (NP (NNP Nuclei)) (PP (IN with) (NP (NP (RB even) (NNS numbers)) (PP (IN of) (NP (NP (NNS protons)) (, ,) (NP (NNS neutrons)) (, ,) (CC or) (NP (DT both))))))) (VP (VBP are) (ADJP (RBR more) (JJ likely) (S (VP (TO to) (VP (VB be) (ADJP (JJ stable))))))) (. .)))