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Nonmetals also have high electron affinity. This means that it is energetically favorable to add an electron to a nonmetal. So, nonmetals can be easily reduced. Metals tend to have low electron affinity so it is more difficult to add electrons (or reduce them). In short: Metals have low ionization energies and low electron affinities so they are readily oxidized. Nonmetals have high ionization energies and high electron affinities so they are readily reduced.
Valency, Oxidation State and Ionic Compounds. When a metal reacts with a non-metal, the metal will lose electrons to form a positive ion and the non-metal will gain electrons to form a negative ion. The compound which is formed will be ionic.