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anonymous - 1/23/2007 9:32:25 PM
The systematic latin names and symbols of all of the elements 111 or higher have not been named until trivial names will be approved by the IUPAC.
John W - 10/19/2004 2:10:24 AM
Those are not the elemental symbols, but rather "default" names derived from the atomic number of the elements which will occupy those spaces once they are discovered.
jessie k - 3/23/2001 2:24:18 AM
why do elements 113 and 115 and 117 have symbols but they have not been discovered yet ?