( ( ( The ( chemical behavior ) ) ( of ( an element ) ) ) ( ( depends ( on ( ( ( its size ) and ) ( ( the number ) ( of ( electrons ( in ( its ( outer shell ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (JJ chemical) (NN behavior)) (PP (IN of) (NP (DT an) (NN element)))) (VP (VBZ depends) (PP (IN on) (NP (NP (PRP$ its) (NN size)) (CC and) (NP (NP (DT the) (NN number)) (PP (IN of) (NP (NP (NNS electrons)) (PP (IN in) (NP (PRP$ its) (JJ outer) (NN shell))))))))) (. .)))
The chemical behavior of an element depends on its size and the number of electrons in its outer shell.
(ROOT (S (NP (NP (DT The) (JJ chemical) (NN behavior)) (PP (IN of) (NP (NNS elements)))) (VP (MD can) (ADVP (RB largely)) (VP (VB be) (VP (VBN explained) (PP (IN by) (NP (NN electron) (NNS configurations)))))) (. .)))