( ( These bonds ) ( ( are ( formed ( by ( ( ( a cloud ) ( of ( valence electrons ) ) ) ( that ( are ( shared ( between ( ( ( positive ( metal ions ) ) ( -LRB- ( cations -RRB- ) ) ) ( in ( a ( crystal lattice ) ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT These) (NNS bonds)) (VP (VBP are) (VP (VBN formed) (PP (IN by) (NP (NP (DT a) (NN cloud)) (PP (IN of) (NP (JJ valence) (NNS electrons))) (SBAR (WHNP (WDT that)) (S (VP (VBP are) (VP (VBN shared) (PP (IN between) (NP (NP (NP (JJ positive) (NN metal) (NNS ions)) (PRN (-LRB- -LRB-) (NP (NNS cations)) (-RRB- -RRB-))) (PP (IN in) (NP (DT a) (NN crystal) (NN lattice))))))))))))) (. .)))
These bonds are formed by a cloud of valence electrons that are shared between positive metal ions (cations) in a crystal lattice.
(ROOT (S (NP (NP (DT The) (NN force)) (PP (IN of) (NP (NP (NN attraction)) (PP (IN between) (NP (NP (DT a) (ADJP (ADVP (RB positively)) (VBN charged)) (NN metal) (NN ion)) (CC and) (NP (NP (DT the) (JJ valence) (NNS electrons)) (SBAR (S (NP (PRP it)) (VP (VBZ shares) (PP (IN with) (NP (NP (JJ other) (NNS ions)) (PP (IN of) (NP (DT the) (NN metal)))))))))))))) (VP (VBZ is) (VP (VBN called) (S (NP (DT a) (-LRB- -LRB-) (NN n) (-RRB- -RRB-) (NN metallic) (NN bond))))) (. .)))
The force of attraction between a positively charged metal ion and the valence electrons it shares with other ions of the metal is called a(n) metallic bond.