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