( ( When ( ( ( the number ) ( of ( electrons ( in ( the atom ) ) ) ) ) ( is ( equal ( to ( ( the number ) ( of protons ) ) ) ) ) ) ) ( , ( ( the atom ) ( ( is ( said ( to ( ( ( be neutral ) or ) ( have ( no charge ) ) ) ) ) ) . ) ) ) )
(ROOT (S (SBAR (WHADVP (WRB When)) (S (NP (NP (DT the) (NN number)) (PP (IN of) (NP (NP (NNS electrons)) (PP (IN in) (NP (DT the) (NN atom)))))) (VP (VBZ is) (ADJP (JJ equal) (PP (TO to) (NP (NP (DT the) (NN number)) (PP (IN of) (NP (NNS protons))))))))) (, ,) (NP (DT the) (NN atom)) (VP (VBZ is) (VP (VBN said) (S (VP (TO to) (VP (VP (VB be) (ADJP (JJ neutral))) (CC or) (VP (VB have) (NP (DT no) (NN charge)))))))) (. .)))
When the number of electrons in the atom is equal to the number of protons, the atom is said to be neutral or have no charge.
(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))) (. .)))