( ( ( ( ( Metals ( ( are usually ) ( thought ( of ( as ( containing ( ( ( close packed ) arrays ) ( of atoms ) ) ) ) ) ) ) ) , ) but ) ( ( ( quite ( a lot ) ) ( of ( molecular solids ) ) ) ( also ( behave ( as ( metallic conductors ) ) ) ) ) ) . )
(ROOT (S (S (NP (NNS Metals)) (VP (VBP are) (ADVP (RB usually)) (VP (VBN thought) (PP (IN of) (PP (IN as) (S (VP (VBG containing) (NP (NP (ADJP (RB close) (VBN packed)) (NNS arrays)) (PP (IN of) (NP (NNS atoms))))))))))) (, ,) (CC but) (S (NP (NP (RB quite) (DT a) (NN lot)) (PP (IN of) (NP (JJ molecular) (NNS solids)))) (VP (ADVP (RB also)) (VB behave) (PP (IN as) (NP (JJ metallic) (NNS conductors))))) (. .)))
Metals are usually thought of as containing close packed arrays of atoms, but quite a lot of molecular solids also behave as metallic conductors.
(ROOT (S (NP (JJ Metallic) (NNS solids)) (VP (VBP are) (VP (VBN composed) (ADVP (RB entirely)) (PP (IN of) (NP (JJ metallic) (NNS atoms))))) (. .)))