 Using Mendeleev's nomenclature for unnamed and undiscovered elements, ununseptium should be known as eka-astatine. Using the 1979 IUPAC recommendations, the element should be temporarily called ununseptium (symbol Uus) until the discovery is confirmed and a permanent name chosen; the temporary name is formed from Latin roots "one", "one", and "seven", a reference to the element's atomic number of 117. Many scientists in the field call it "element 117", with the symbol (117) or 117. According to guidelines of the International Union of Pure and Applied Chemistry (IUPAC) valid at the moment of the discovery approval, the permanent names of new elements should have ended in "-ium"; this included ununseptium, even if the element was a halogen, which traditionally have names ending in "-ine"; however, the new recommendations published in 2016 recommended using the "-ine" ending for new group 17 elements.
