Ununseptium (pronounced /uːnuːnˈsɛptiəm/ ( listen) oon-oon-SEP-tee-əm) is the temporary name of an undiscovered chemical element with the temporary symbol Uus and atomic number 117. It is the only missing element in period 7 of the periodic table. Since it is placed below the halogens it may share qualities similar to astatine or iodine. The first attempt to synthesize this element is currently underway at the Flerov Laboratory of Nuclear Reactio...
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Ununseptium (pronounced /uːnuːnˈsɛptiəm/ ( listen) oon-oon-SEP-tee-əm) is the temporary name of an undiscovered chemical element with the temporary symbol Uus and atomic number 117. It is the only missing element in period 7 of the periodic table. Since it is placed below the halogens it may share qualities similar to astatine or iodine. The first attempt to synthesize this element is currently underway at the Flerov Laboratory of Nuclear Reactions in Dubna, Russia.
The element with Z=117 is historically known as eka-astatine (see 'eka' terminology). The name ununseptium is a systematic element name, used as a placeholder until the element is discovered, the discovery is acknowledged by the IUPAC, and the IUPAC decides on a name. Usually, the name suggested by the discoverer(s) is chosen.
According to current guidelines from IUPAC, the ultimate name for all new elements should end in "-ium", which means the name for element 117 may end in -ium, not -ine, even if ununseptium turns out...
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