( ( 8 ( O ( oxygen Oxygen ) ) ) ( ( is ( ( the ( second ( ( most abundant ) element ) ) ) ( on ( earth ( -LRB- ( ( after silicon ) -RRB- ) ) ) ) ) ) . ) )
(ROOT (S (NP (CD 8) (NNP O) (NN oxygen) (NN Oxygen)) (VP (VBZ is) (NP (NP (DT the) (JJ second) (ADJP (RBS most) (JJ abundant)) (NN element)) (PP (IN on) (NP (NP (NN earth)) (PRN (-LRB- -LRB-) (PP (IN after) (NP (NN silicon))) (-RRB- -RRB-)))))) (. .)))
8 O oxygen Oxygen is the second most abundant element on earth (after silicon).
(ROOT (S (NP (NNP Oxygen)) (VP (VBZ is) (NP (NP (DT the) (NN name)) (PP (IN of) (NP (DT the) (JJ second) (ADJP (RBS most) (JJ electronegative)) (NN element))))) (. .)))