( ( ( the molecules ) ( in ( chemical ( non-metal elements ) ) ) ) ( ( ( contain ( atoms ( of ( only ( one type ) ) ) ) ) ( so ( we ( will ( continue ( ( call ( them ( the ( chemical elements ) ) ) ) ( as ( they ( ( ( are not ) merely ) ( ( ( ( parts ( of molecules ) ) , ) but ) ( chemicals ( in ( their ( own right ) ) ) ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (DT the) (NNS molecules)) (PP (IN in) (NP (JJ chemical) (JJ non-metal) (NNS elements)))) (VP (VBP contain) (NP (NP (NNS atoms)) (PP (IN of) (NP (RB only) (CD one) (NN type)))) (SBAR (IN so) (S (NP (PRP we)) (VP (MD will) (VP (VB continue) (S (VP (VB call) (S (NP (PRP them)) (NP (DT the) (NN chemical) (NNS elements))) (SBAR (IN as) (S (NP (PRP they)) (VP (VBP are) (RB not) (ADVP (RB merely)) (NP (NP (NP (NNS parts)) (PP (IN of) (NP (NNS molecules)))) (, ,) (CC but) (NP (NP (NNS chemicals)) (PP (IN in) (NP (PRP$ their) (JJ own) (NN right))))))))))))))) (. .)))
the molecules in chemical non-metal elements contain atoms of only one type so we will continue call them the chemical elements as they are not merely parts of molecules, but chemicals in their own right.
(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))))))))))) (. .)))