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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.
A good rule of thumb to remember is that compounds containing two non-metals (on the right side of the periodic table, for the most part) are usually COVALENT in bonding nature, while a compound containing a metal and a non-metal (like all 3 you listed here) are IONIC in bonding nature.eport Abuse. metal to non metal is ionic non metal to non metal is covalent anything on the left side (groups 1a 2a and the transition metals) are metals and the right side (4a 5a 6a 7a) are non metals.