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Metals in general have low Electronegativities and low Electron affinities, and this is because their valence shells aren't as complete as compared to nonmetals, so for them to achieve stability it is easier to lose the little amounts of valence electrons they have than to try and gain a lot of valence electrons in order to complete their shell. This is why a bond between a metal and a nonmetal is ionic- the metal desires to fully lose the electron(s), so it transfers them over to the nonmetal which is desires to fully gain them.
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