( ( In ( an element ) ) ( , ( ( all ( the atoms ) ) ( ( ( have ( ( the ( same number ) ) ( of ( ( protons or ) electrons ) ) ) ) ( although ( ( ( the number ) ( of neutrons ) ) ( may vary ) ) ) ) . ) ) ) )
(ROOT (S (PP (IN In) (NP (DT an) (NN element))) (, ,) (NP (PDT all) (DT the) (NNS atoms)) (VP (VBP have) (NP (NP (DT the) (JJ same) (NN number)) (PP (IN of) (NP (NNS protons) (CC or) (NNS electrons)))) (SBAR (IN although) (S (NP (NP (DT the) (NN number)) (PP (IN of) (NP (NNS neutrons)))) (VP (MD may) (VP (VB vary)))))) (. .)))
In an element, all the atoms have the same number of protons or electrons although the number of neutrons may vary.
(ROOT (S (NP (NP (DT The) (NN number)) (PP (IN of) (NP (NNS neutrons)))) (VP (MD can) (VP (VB vary) (PP (IN between) (NP (NP (NNS atoms)) (PP (IN of) (NP (DT the) (JJ same) (NN element))))))) (. .)))