( ( These ( two ( oxygen atoms ) ) ) ( ( share ( ( ( ( ( ( two pairs ) ( of ( valence electrons ) ) ) ( -LRB- ( ( ( four ( valence electrons ) ) total ) -RRB- ) ) ) ( between them ) ) , ) ( forming ( a ( DOUBLE ( COVALENT BOND ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT These) (CD two) (NN oxygen) (NNS atoms)) (VP (VBP share) (NP (NP (NP (NP (CD two) (NNS pairs)) (PP (IN of) (NP (JJ valence) (NNS electrons)))) (PRN (-LRB- -LRB-) (S (NP (CD four) (JJ valence) (NNS electrons)) (VP (VBP total))) (-RRB- -RRB-))) (PP (IN between) (NP (PRP them))) (, ,) (VP (VBG forming) (NP (DT a) (NNP DOUBLE) (NNP COVALENT) (NN BOND))))) (. .)))
These two oxygen atoms share two pairs of valence electrons (four valence electrons total) between them, forming a DOUBLE COVALENT BOND .
(ROOT (S (NP (CD Four) (JJ valence) (NNS electrons)) (VP (MD can) (VP (VB be) (VP (VBN found) (PP (IN in) (NP (DT a) (NN carbon) (NN atom)))))) (. .)))