There are 7 nonmetal elements:: Hydrogen (sometimes considered an alkali metal) Carbon. Nitrogen. Oxygen. Phosphorus. Sulfur. Selenium. Although these are the elements in the group nonmetals, there are two additional element groups that could be included, since the halogens and noble gases also are types of nonmetals. List of All …
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Nonmetals are typically poor conductors of heat and electricity, with low melting and boiling points. They tend not to be malleable or ductile, so they form brittle solids. Nonmetals include solids, liquids, and gases at room temperature and pressure.
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Non-metals are defined as the elements which easily form negative ions by accepting electrons and do not conduct heat and electricity. The best examples of non-metals were carbon and oxygen which is responsible for life on this earth.
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The two tables in this section list some of the properties of five types of elements (noble gases, halogen nonmetals, unclassified nonmetals, metalloids and, for comparison, metals) based on their most stable forms at standard temperature and pressure.
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The nonmetal element group consists of hydrogen, carbon, nitrogen, oxygen, phosphorus, sulfur and selenium. Hydrogen acts as a nonmetal at normal temperatures and pressure and is generally accepted to be part of the nonmetal group. The halogens are nonmetals in group 7 of the periodic table.
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nonmetal, in physics, a substance having a finite activation energy (band gap) for electron conduction. This means that nonmetals display low (insulators) to moderate (semiconductors) bulk electrical conductivities, which increase with increasing temperature, and are subject to dielectric breakdown at high voltages and temperatures.
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Nonmetals are generally poor conductors of heat and electricity. Properties of nonmetals are usually the opposite of properties of metals. Nonmetals can be solid, liquid, or gas at room temperature depending upon the element. Sulfur, bromine, and helium are typical nonmetals.
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