( ( ( An ( electron flow ) ) ( from ( ( the mouth ) ( to ( the nose ) ) ) ) ) ( ( moves ( with ( it ( positively ( charged ( metallic ions ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (DT An) (NN electron) (NN flow)) (PP (IN from) (NP (NP (DT the) (NN mouth)) (PP (TO to) (NP (DT the) (NN nose)))))) (VP (VBZ moves) (SBAR (IN with) (S (NP (PRP it)) (ADVP (RB positively)) (VP (VBD charged) (NP (JJ metallic) (NNS ions)))))) (. .)))
An electron flow from the mouth to the nose moves with it positively charged metallic ions.
(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.