( ( ( The number ) ( of ( electrons ( in ( a ( neutral atom ) ) ) ) ) ) ( ( equals ( ( the number ) ( of protons ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (NN number)) (PP (IN of) (NP (NP (NNS electrons)) (PP (IN in) (NP (DT a) (JJ neutral) (NN atom)))))) (VP (VBZ equals) (NP (NP (DT the) (NN number)) (PP (IN of) (NP (NNS protons))))) (. .)))
The number of electrons in a neutral atom equals the number of protons.
(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))) (. .)))