( ( Because ( carbon ( has ( ( ( four ( valence electrons ) ) , ) ( one ( in ( each ( of ( the ( four pairs ) ) ) ) ) ) ) ) ) ) ( , ( it ( ( ( is ( more ( willing ( to ( ( share electrons ) ( with ( another atom ) ) ) ) ) ) ) ( -LRB- ( ( rather ( than ( ( ( grabbing them ) or ) ( ( giving them ) up ) ) ) ) -RRB- ) ) ) . ) ) ) )
(ROOT (S (SBAR (IN Because) (S (NP (NN carbon)) (VP (VBZ has) (NP (NP (CD four) (JJ valence) (NNS electrons)) (, ,) (NP (NP (CD one)) (PP (IN in) (NP (NP (DT each)) (PP (IN of) (NP (DT the) (CD four) (NNS pairs)))))))))) (, ,) (NP (PRP it)) (VP (VBZ is) (ADJP (RBR more) (JJ willing) (S (VP (TO to) (VP (VB share) (NP (NNS electrons)) (PP (IN with) (NP (DT another) (NN atom))))))) (PRN (-LRB- -LRB-) (PP (RB rather) (IN than) (S (VP (VP (VBG grabbing) (NP (PRP them))) (CC or) (VP (VBG giving) (NP (PRP them)) (PRT (RP up)))))) (-RRB- -RRB-))) (. .)))
Because carbon has four valence electrons, one in each of the four pairs, it is more willing to share electrons with another atom (rather than grabbing them or giving them up).
(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)))))) (. .)))