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In an ionic bond, one atom looses all its outer electrons (leaving behind a filled inner shell) while another atom gains electron(s) to fill its valence shell. When you draw an ion, don't forget [ ] and a charge. The two ions attract each other according to Coulombic interactions.
Look the metal has no valence electrons and the nonmetal is full. Always!!!! LiF==> or Li2O==>
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