( ( For ( an ( ( electrically neutral ) atom ) ) ) ( , ( ( ( the number ) ( of ( ( protons and ) ( ( the number ) ( of electrons ) ) ) ) ) ( ( is ( equal ( to ( the ( atomic number ) ) ) ) ) . ) ) ) )
(ROOT (S (PP (IN For) (NP (DT an) (ADJP (ADVP (RB electrically)) (JJ neutral)) (NN atom))) (, ,) (NP (NP (DT the) (NN number)) (PP (IN of) (NP (NP (NNS protons)) (CC and) (NP (NP (DT the) (NN number)) (PP (IN of) (NP (NNS electrons))))))) (VP (VBZ is) (ADJP (JJ equal) (PP (TO to) (NP (DT the) (JJ atomic) (NN number))))) (. .)))
For an electrically neutral atom, the number of protons and the number of electrons is equal to the atomic number.
(ROOT (S (SBAR (IN Because) (S (NP (NNS atoms)) (VP (VBP have) (NP (NP (JJ equal) (NNS numbers)) (PP (IN of) (NP (NP (JJ positive) (NNS protons)) (CC and) (NP (JJ negative) (NNS electrons)))))))) (, ,) (NP (PRP they)) (VP (VBP possess) (NP (DT a) (JJ neutral) (NN charge))) (. .)))