![]() ![]() The nonmetals are distinguished based on the molecular structures of their most thermodynamically stable forms in ambient conditions. Very electronegative nonmetals have electronegativity values over 2.8 electronegative nonmetals have values of 1.9 to 2.8. The nonmetals are divided based on a loose correlation between electronegativity and oxidizing power. The nonmetals are simply classified according to their inclination to form chemical compounds. Provided that this is done, however, it constitutes a very useful classification, and although purists often despise it because of its approximate nature, the fact is that practising chemists make a great deal of use of it, if only subconsciously, in thinking of the chemistry of different elements." Two classes Įxamples have author labels for convenience, rather than precedence Reactive nonmetal As expressed by Nelson: "…care needs to be taken to remember that… is only an approximation, and can only be used as a rough guide to the properties of the elements. Boundary overlaps can occur as outlying elements in each class show or begin to show less-distinct, hybrid-like, or atypical properties. The distinction between classes is not absolute. The nonmetallic elements are sometimes instead divided into two to six (or seven) alternative classes or sets according to, for example, electronegativity the relative homogeneity of the halogens molecular structure the peculiar nature of hydrogen the corrosive nature of oxygen and the halogens their respective groups and variations thereupon.Ĭlasses provided an economy of description and are beneficial to structuring knowledge and understanding of science. In chemistry, after nonmetallic elements such as silicon, chlorine, and helium are classed as either metalloids, halogens, or noble gases, the remaining unclassified elements are hydrogen, carbon, nitrogen, oxygen, phosphorus, sulfur and selenium.
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