( ( ( 9.25 ( Use ( atomic models ) ) ) ( to ( explain ( ( ( ( that ( matter ( is ( composed ( of ( ( tiny particles ) ( called ( atoms ( that ( are ( unique ( to ( each element ) ) ) ) ) ) ) ) ) ) ) ) ) , ) and ) ( that ( atoms ( are ( composed ( of ( subatomic particles ) ) ) ) ) ) ) ) ) ) ( ( called ( ( ( ( ( protons , ) neutrons ) , ) and ) electrons ) ) . ) )
(ROOT (S (NP (NP (CD 9.25) (NNP Use) (JJ atomic) (NNS models)) (SBAR (S (VP (TO to) (VP (VB explain) (SBAR (SBAR (IN that) (S (NP (NN matter)) (VP (VBZ is) (VP (VBN composed) (PP (IN of) (NP (NP (JJ tiny) (NNS particles)) (VP (VBN called) (NP (NP (NNS atoms)) (SBAR (WHNP (WDT that)) (S (VP (VBP are) (ADJP (JJ unique) (PP (TO to) (NP (DT each) (NN element))))))))))))))) (, ,) (CC and) (SBAR (IN that) (S (NP (NNS atoms)) (VP (VBP are) (VP (VBN composed) (PP (IN of) (NP (JJ subatomic) (NNS particles))))))))))))) (VP (VBD called) (NP (NP (NNS protons)) (, ,) (NP (NNS neutrons)) (, ,) (CC and) (NP (NNS electrons)))) (. .)))
9.25 Use atomic models to explain that matter is composed of tiny particles called atoms that are unique to each element, and that atoms are composed of subatomic particles called protons, neutrons, and electrons.
(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))))))) (. .)))