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By contrast, metals generally form basic oxides. An exception is graphite, an allotrope of carbon, which is a good conductor of electricity.
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Examples of compounds of nonmetals include the carbonates, nitrates, oxides, sulfides, sulfates, phosphates, and halides. The other nonmetals occur mainly as compounds.
#Periodic table metals and nonmetals free#
Hydrogen, carbon, nitrogen, oxygen, sulfur, and the noble gases can be found in the form of free (uncombined) elements as well as compounds in nature. They are separated from metals by the group of elements known as metalloids. If one looks at their positions in the periodic table, it is clear that almost all the nonmetals (except for hydrogen) are located on the upper right-hand side of the table. Group 18 (the noble gases), all elements: Helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), radon (Rn).Group 17 (the halogens), all elements: Fluorine (F), chlorine (Cl), bromine (Br), iodine (I), astatine (At).Group 16 (the chalcogens): Oxygen (O), sulfur (S), selenium (Se).Group 15 (the pnictogens): Nitrogen (N), phosphorus (P).The elements generally regarded as nonmetals are noted below, along with their groups in the periodic table. However, nonmetals and their compounds make up most of the crust, atmosphere, and oceans of the Earth, as well as constituting most of the bulk tissues of living organisms. Only 18 elements of the periodic table are generally considered nonmetals, whereas more than 80 elements are considered metals.