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nonmetal
A substance – particularly, an element – showing none of the properties characteristic of metals. (See also metalloid.) The 17 or so nonmetallic elements fill the top right-hand corner of the periodic table. Their atoms are in general relatively small, with nearly-filled electron shells, and have high ionization potentials. They have high electronegativities, and tend to form covalent bonds with each other, and to form anions.
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