( ( These ( physical properties ) ) ( ( are ( due ( to ( ( the nature ) ( of ( metallic bonding ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT These) (JJ physical) (NNS properties)) (VP (VBP are) (ADJP (JJ due) (PP (TO to) (NP (NP (DT the) (NN nature)) (PP (IN of) (NP (JJ metallic) (NN bonding))))))) (. .)))
These physical properties are due to the nature of metallic bonding.
(ROOT (S (NP (DT The) (JJ metallic) (NN bond)) (VP (VBZ is) (ADJP (JJ responsible) (PP (IN for) (NP (NP (DT the) (NNS properties)) (PP (IN of) (NP (NNS metals))))))) (. .)))