Thus, elements 117 and 118 were ununseptium and ununoctium, not ununseptine and ununocton. However, the systematic names use -ium for all elements regardless of group. Traditionally the suffix -ium was used only for metals (or at least elements that were expected to be metallic), and other elements used different suffixes: halogens used -ine and noble gases used -on instead. There are two elision rules designed to prevent odd-looking names. Some of the roots are Latin and others are Greek, to avoid two digits starting with the same letter (for example, the Greek-derived pent is used instead of the Latin-derived quint to avoid confusion with quad for 4). The roots are concatenated, and the name is completed by the suffix -ium. Each digit is translated into a "numerical root" according to the table. The temporary names derive systematically from the element's atomic number, and apply only to 101 ≤ Z ≤ 999. This approach to naming originated in the successful development of regular rules for the naming of organic compounds. In order to discuss such elements without ambiguity, the International Union of Pure and Applied Chemistry (IUPAC) uses a set of rules, adopted in 1978, to assign a temporary systematic name and symbol to each such element. In some cases, such as the Transfermium Wars, controversies over the formal name and symbol have been protracted and highly political. In chemistry, a transuranic element receives a permanent name and symbol only after its synthesis has been confirmed. A systematic symbol is also derived from this name. A systematic element name is the temporary name assigned to an unknown or recently synthesized chemical element.
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