( Elements ( ( are ( ( pure substances ) ( that ( ( ( are ( ( made up ) ( of ( ( a ( single kind ) ) ( of ( atom ( -LRB- ( ( atoms ( with ( ( the ( same number ) ) ( of protons ) ) ) ) -RRB- ) ) ) ) ) ) ) ) and ) ( ( can not ) ( be ( ( separated ( into ( different substances ) ) ) ( by ( ordinary ( chemical methods ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNS Elements)) (VP (VBP are) (NP (NP (JJ pure) (NNS substances)) (SBAR (WHNP (WDT that)) (S (VP (VP (VBP are) (VP (VBN made) (PRT (RP up)) (PP (IN of) (NP (NP (DT a) (JJ single) (NN kind)) (PP (IN of) (NP (NP (NN atom)) (PRN (-LRB- -LRB-) (NP (NP (NNS atoms)) (PP (IN with) (NP (NP (DT the) (JJ same) (NN number)) (PP (IN of) (NP (NNS protons)))))) (-RRB- -RRB-)))))))) (CC and) (VP (MD can) (RB not) (VP (VB be) (VP (VBN separated) (PP (IN into) (NP (JJ different) (NNS substances))) (PP (IN by) (NP (JJ ordinary) (NN chemical) (NNS methods))))))))))) (. .)))
Elements are pure substances that are made up of a single kind of atom (atoms with the same number of protons) and cannot be separated into different substances by ordinary chemical methods.
(ROOT (S (S (NP (PRP You)) (VP (VBP call) (NP (NP (DT a) (NN substance)) (SBAR (WHNP (WDT that)) (S (VP (MD can) (RB not) (VP (VB be) (VP (VBN separated) (PP (IN into) (NP (NP (JJR smaller) (NNS pieces)) (, ,) (SBAR (WHNP (WDT which)) (S (VP (VBZ is) (ADVP (RB also)) (VP (VBN defined) (PP (IN by) (NP (NP (DT the) (NN number)) (PP (IN of) (NP (NNS protons))))))))))))))))))) (NP (PRP it)) (VP (VP (VBZ has)) (, ,) (NP (DT a) (PRN (-LRB- -LRB-) (NP (NN n)) (-RRB- -RRB-)) (NN element))) (. .)))