( ( ( The ( central core ) ) ( of ( ( ( ( the atom ) ( is ( called ( the nucleus ) ) ) ) and ) ( it contains ) ) ) ) ( positively ( ( charged ( particles ( called ( ( ( ( protons and ) neutral ) particles ) ( called neutrons ) ) ) ) ) . ) ) )
(ROOT (S (NP (NP (DT The) (JJ central) (NN core)) (PP (IN of) (S (S (NP (DT the) (NN atom)) (VP (VBZ is) (VP (VBN called) (NP (DT the) (NN nucleus))))) (CC and) (S (NP (PRP it)) (VP (VBZ contains)))))) (ADVP (RB positively)) (VP (VBD charged) (SBAR (S (NP (NNS particles)) (VP (VBD called) (SBAR (S (NP (ADJP (JJ protons) (CC and) (JJ neutral)) (NNS particles)) (VP (VBD called) (NP (NNS neutrons))))))))) (. .)))
The central core of the atom is called the nucleus and it contains positively charged particles called protons and neutral particles called neutrons.
(ROOT (S (NP (NNS Protons) (CC and) (NNS neutrons)) (VP (VBP are) (VP (VBN located) (PP (IN in) (NP (DT the) (JJ central) (NN nucleus))))) (. .)))