( ( When ( they ( join ( with ( other elements ) ) ) ) ) ( non-metals ( ( can ( either ( ( ( ( share ( electrons ( in ( ( ( a ( covalent bond ) ) or ) ( gain electrons ) ) ) ) ) ( to ( become ( a ( negative ion ) ) ) ) ) and ) ( make ( an ( ionic bond ) ) ) ) ) ) . ) ) )
(ROOT (S (SBAR (WHADVP (WRB When)) (S (NP (PRP they)) (VP (VBP join) (PP (IN with) (NP (JJ other) (NNS elements)))))) (NP (NNS non-metals)) (VP (MD can) (VP (DT either) (VP (VB share) (NP (NP (NNS electrons)) (PP (IN in) (NP (NP (DT a) (JJ covalent) (NN bond)) (CC or) (NP (NN gain) (NNS electrons))))) (S (VP (TO to) (VP (VB become) (NP (DT a) (JJ negative) (NN ion)))))) (CC and) (VP (VB make) (NP (DT an) (JJ ionic) (NN bond))))) (. .)))
When they join with other elements non-metals can either share electrons in a covalent bond or gain electrons to become a negative ion and make an ionic bond.
(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.