( ELEMENTS ( ( Substances ( that ( contain ( ( only ( one kind ) ) ( of atom ) ) ) ) ) . ) )
(ROOT (S (NP (NNS ELEMENTS)) (VP (VBZ Substances) (SBAR (IN that) (S (VP (VBP contain) (NP (NP (RB only) (CD one) (NN kind)) (PP (IN of) (NP (NN atom)))))))) (. .)))
ELEMENTS Substances that contain only one kind 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))))))))))) (. .)))