( Neutrons ( - ( ( electrically ( neutral ( charge particles ) ) ) ( , ( ( number ( of neutrons ) ) ( can ( vary ( -LRB- ( isotopes -RRB- ) ) ) ) ) ) ) ) )
(ROOT (FRAG (NP (NNS Neutrons)) (: -) (S (S (VP (VBG electrically) (NP (JJ neutral) (NN charge) (NNS particles)))) (, ,) (NP (NP (NN number)) (PP (IN of) (NP (NNS neutrons)))) (VP (MD can) (VP (VB vary) (NP (-LRB- -LRB-) (NNS isotopes) (-RRB- -RRB-)))))))
Neutrons- electrically neutral charge particles, number of neutrons can vary (isotopes)
(ROOT (S (NP (NNS Neutrons)) (VP (VBP are) (ADVP (RB electrically)) (ADJP (JJ neutral))) (. .)))