( ( ( The number ) ( of ( protons ( in ( a ( given nucleus ) ) ) ) ) ) ( ( ( ( is ( ( the ( atomic number ) ) ( of ( that nucleus ) ) ) ) and ) ( determines ( which ( ( ( chemical element ) ( the nucleus ) ) ( will ( constitute ( when ( surrounded ( by electrons ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (NN number)) (PP (IN of) (NP (NP (NNS protons)) (PP (IN in) (NP (DT a) (VBN given) (NN nucleus)))))) (VP (VP (VBZ is) (NP (NP (DT the) (JJ atomic) (NN number)) (PP (IN of) (NP (DT that) (NN nucleus))))) (CC and) (VP (VBZ determines) (SBAR (WHNP (WDT which)) (S (NP (NP (NN chemical) (NN element)) (NP (DT the) (NN nucleus))) (VP (MD will) (VP (VB constitute) (SBAR (WHADVP (WRB when)) (S (VP (VBN surrounded) (PP (IN by) (NP (NNS electrons)))))))))))) (. .)))
The number of protons in a given nucleus is the atomic number of that nucleus and determines which chemical element the nucleus will constitute when surrounded by electrons.
(ROOT (S (NP (NP (DT The) (NN chemistry)) (PP (IN of) (NP (DT each) (NN element)))) (VP (VBZ is) (VP (VBN determined) (PP (IN by) (NP (NP (PRP$ its) (NN number)) (PP (IN of) (NP (NNS protons) (CC and) (NNS electrons))))))) (. .)))