( ( ( The ( third ( basic particle ) ) ) ( in ( ( ( ( an atom ) , ) ( the neutron ) ) , ) ) ) ( ( was ( discovered ( in 1932 ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (JJ third) (JJ basic) (NN particle)) (PP (IN in) (NP (NP (DT an) (NN atom)) (, ,) (NP (DT the) (NN neutron)) (, ,)))) (VP (VBD was) (VP (VBN discovered) (PP (IN in) (NP (CD 1932))))) (. .)))
The third basic particle in an atom, the neutron , was discovered in 1932.
(ROOT (S (NP (DT A) (NN neutron)) (VP (VBZ collides) (PP (IN with) (NP (NP (DT an) (NN atom)) (PP (IN of) (NP (ADJP (JJ u-235) (PP (IN during) (NP (DT the) (JJ basic) (JJ nuclear) (NN fission)))) (NN process)))))) (. .)))
A neutron collides with an atom of u-235 during the basic nuclear fission process.