( Mercury ( ( is ( so ( poor ( at ( ( forming ( metallic bonds ) ) ( that ( it ( is ( liquid ( at ( room temperature ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Mercury)) (VP (VBZ is) (ADJP (RB so) (JJ poor) (PP (IN at) (S (VP (VBG forming) (NP (JJ metallic) (NNS bonds)) (SBAR (IN that) (S (NP (PRP it)) (VP (VBZ is) (ADJP (JJ liquid) (PP (IN at) (NP (NN room) (NN temperature)))))))))))) (. .)))
Mercury is so poor at forming metallic bonds that it is liquid at room temperature.
(ROOT (S (NP (NNP Mercury)) (VP (VBZ is) (NP (NP (DT the) (CD one) (NN metal)) (SBAR (WHNP (WDT that)) (S (VP (VBZ melts) (PP (IN below) (NP (NN room) (NN temperature)))))))) (. .)))