( ( When ( ( ( three pairs ) ( of electrons ) ) ( are ( shared ( between ( ( two atoms ) ( in ( a molecule ) ) ) ) ) ) ) ) ( , ( they ( ( form ( ( a ( triple bond ) ) ( between ( the atoms ) ) ) ) . ) ) ) )
(ROOT (S (SBAR (WHADVP (WRB When)) (S (NP (NP (CD three) (NNS pairs)) (PP (IN of) (NP (NNS electrons)))) (VP (VBP are) (VP (VBN shared) (PP (IN between) (NP (NP (CD two) (NNS atoms)) (PP (IN in) (NP (DT a) (NN molecule))))))))) (, ,) (NP (PRP they)) (VP (VBP form) (NP (NP (DT a) (JJ triple) (NN bond)) (PP (IN between) (NP (DT the) (NNS atoms))))) (. .)))
When three pairs of electrons are shared between two atoms in a molecule, they form a triple bond between the atoms.
(ROOT (S (PP (IN In) (NP (DT a) (NN carbon) (JJ triple) (NN bond))) (, ,) (NP (NP (CD three) (NNS pairs)) (PP (IN of) (NP (NNS electrons)))) (VP (VBP are) (VP (VBN shared))) (. .)))