( ( ELEMENTS ( , ( COMPOUNDS ( AND ( MIXTURES Elements ) ) ) ) ) ( ( are ( substances ( that ( contain ( ( only ( one type ) ) ( of atom ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP ELEMENTS) (, ,) (NNP COMPOUNDS) (CC AND) (NNP MIXTURES) (NNP Elements)) (VP (VBP are) (NP (NP (NNS substances)) (SBAR (WHNP (WDT that)) (S (VP (VBP contain) (NP (NP (RB only) (CD one) (NN type)) (PP (IN of) (NP (NN atom))))))))) (. .)))
ELEMENTS, COMPOUNDS AND MIXTURES Elements are substances that contain only one type of atom.
(ROOT (S (NP (PRP You)) (VP (VBP call) (NP (NP (NNS elements)) (SBAR (WHNP (WDT that)) (S (VP (VBP contain) (NP (NP (JJ only) (NNS atoms)) (PP (IN of) (NP (NP (CD one) (NN type)) (PP (IN of) (NP (NN element) (NN native) (NNS elements))))))))))) (. .)))