( ( In ( ( an atom ) ( with ( a ( neutral charge ) ) ) ) ) ( , ( ( ( the number ) ( of electrons ) ) ( ( equals ( ( the number ) ( of protons ) ) ) . ) ) ) )
(ROOT (S (PP (IN In) (NP (NP (DT an) (NN atom)) (PP (IN with) (NP (DT a) (JJ neutral) (NN charge))))) (, ,) (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 an atom with a neutral charge, 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))) (. .)))