( ( Neutron ( The neutron ) ) ( ( is ( a ( subatomic particle ) ) ) . ) )
(ROOT (S (NP (JJ Neutron) (DT The) (NN neutron)) (VP (VBZ is) (NP (DT a) (JJ subatomic) (NN particle))) (. .)))
Neutron The neutron is a subatomic particle.
(ROOT (S (NP (NP (DT The) (NN number)) (PP (IN of) (NP (NNS neutrons)))) (VP (MD can) (VP (VB vary) (PP (IN between) (NP (NP (NNS atoms)) (PP (IN of) (NP (DT the) (JJ same) (NN element))))))) (. .)))