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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.
Metals have one to three electrons in their outer shell, whereas non-metals have four to eight electrons. Another difference is that metals tend to lose their valence electrons, but non-metals share or gain valence electrons. Where metals form oxides which are basic, non-metals form oxides which are acidic.While metals are very good reducing agents, non-metals are very good oxidising agents. Now, considering the difference between their physical properties, metals are malleable, which means it can be beaten to thin sheets.On the other hand, non-metals are very brittle. When comparing their density, metals have a high to moderate density, whereas non-metals have low to moderate density.etals and non-metals can be easily differentiated. In the periodic table, the metals are placed on the left, and the non-metals on the right. First of all, letâs look at the difference in the chemical properties between metals and non-metals.