( ( Like ( hydrogen bonding ) ) ( , ( it ( ( ( is not ) ( ( ( ( ( a ( chemical bond ) ) , ) but ) simply ) ( ( a name ) ( for ( ( an ( attractive force ) ) ( between ( metal atoms ) ) ) ) ) ) ) . ) ) ) )
(ROOT (S (PP (IN Like) (NP (NN hydrogen) (NN bonding))) (, ,) (NP (PRP it)) (VP (VBZ is) (RB not) (NP (NP (DT a) (JJ chemical) (NN bond)) (, ,) (CC but) (RB simply) (NP (NP (DT a) (NN name)) (PP (IN for) (NP (NP (DT an) (JJ attractive) (NN force)) (PP (IN between) (NP (NN metal) (NNS atoms)))))))) (. .)))
Like hydrogen bonding, it is not a chemical bond, but simply a name for an attractive force between metal atoms.
(ROOT (S (NP (DT A) (-LRB- -LRB-) (NN n) (-RRB- -RRB-) (NN chemical) (NN bond)) (VP (VBZ is) (NP (NP (DT a) (NN force)) (PP (IN of) (NP (NP (NN attraction)) (PP (IN between) (NP (NNS ions) (CC and) (NNS atoms))))))) (. .)))