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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.
They have oxidation numbers of Â±4, -3, and -2. The Non-Metal elements are: Hydrogen Carbon Nitrogen Oxygen Phosphorus Sulfur Selenium This website is copyright Â© 1996-2012 Yinon Bentor. Non-metals are the elements in groups 14-16 of the periodic table. Non-metals are not able to conduct electricity or heat very well.As opposed to metals, non-metallic elements are very brittle, and cannot be rolled into wires or pounded into sheets.The non-metals exist in two of the three states of matter at room temperature: gases (such as oxygen) and solids (such as carbon).s opposed to metals, non-metallic elements are very brittle, and cannot be rolled into wires or pounded into sheets. The non-metals exist in two of the three states of matter at room temperature: gases (such as oxygen) and solids (such as carbon).