Nonmetal inconsistently classified by different authors. Elements sometimes also classified as nonmetals are the metalloids boron (B), silicon (Si), germanium (Ge), arsenic (As), antimony (Sb), tellurium (Te), and astatine (At). The nonmetal selenium (Se) is sometimes instead classified as a metalloid, particularly in environmental chemistry. Nonmetals show more variability in their properties than do metals. These properties are largely determined by the interatomic bonding strengths and molecular structures of the nonmetals involved, both of which are subject to variation as the number of valence electrons in each nonmetal varies. Metals, in contrast, have more homogenous structures and their properties are more
Element Six oil and gas drilling to precision machining and electronics. Products offered by Element Six fall into two broad categories - superabrasives and advanced diamond products. The largest part of the company's business today is in superabrasives. These products are based on the world's hardest materials such as synthetic diamond and cubic boron nitride that are used in a wide range of cutting, grinding and drilling applications range from oil and gas exploration to machine tools, automotive part manufacturing and marble production. Element Six Element Six is a member of the De Beers Group of Companies, its majority shareholder. Element Six