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An atomic arrangement in which two single chains of silica tetrahedra bond together by sharing the third oxygen in alternate tetrahedra. Feldspar group A group of silicate minerals in which silica tetrahedra are arranged in a framework structure and containing potassium, calcium or sodium cations.
Group 14 is the carbon family. The five members are carbon, silicon, germanium, tin, and lead. All of these elements have four electrons in their outermost energy level. Of the Group 14 elements, only carbon and silicon form bonds as nonmetals (sharing electrons covalently). Silicon and germanium are semimetals (metalloids), existing in compounds with either +4 or -4 charges. Tin and lead are definitely metals.