( ( Bonding ( Such bonds ) ) ( ( could ( be ( formed ( between ( ( metal atoms ) ( that ( ( ( have ( low electronegativities ) ) and ) ( ( do not ) ( ( attract ( their ( valence electrons ) ) ) strongly ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (VBG Bonding) (JJ Such) (NNS bonds)) (VP (MD could) (VP (VB be) (VP (VBN formed) (PP (IN between) (NP (NP (NN metal) (NNS atoms)) (SBAR (WHNP (WDT that)) (S (VP (VP (VBP have) (NP (JJ low) (NNS electronegativities))) (CC and) (VP (VBP do) (RB not) (VP (VB attract) (NP (PRP$ their) (JJ valence) (NNS electrons)) (ADVP (RB strongly)))))))))))) (. .)))
Bonding Such bonds could be formed between metal atoms that have low electronegativities and do not attract their valence electrons strongly.
(ROOT (S (NP (DT A) (JJ metallic) (NN bond)) (VP (VBZ is) (NP (NP (DT the) (NN force)) (PP (IN of) (NP (NP (NN attraction)) (PP (IN between) (NP (NP (DT a) (JJ positive) (NN metal) (NN ion)) (CC and) (NP (JJ valence) (NNS electrons)))))))) (. .)))