Updating the Periodic Table – IUPAC and IUPAP have officially added elements 114 and 116 to the Periodic Table. The elements with atomic weights of 289 and 292, respectively, were first sighted more than a decade ago. However, the International Union of Pure and Applied Chemistry (IUPAC)and the International Union of Pure and Applied Physics (IUPAP) require strong evidence before elemental discoveries are incorporated into the PT. In recent discussions they also heard arguments for why elements 113, 115, and 118, should be added, but this was not deemed adequate at this time. The more recently created element 117 was not even minuted.
The very structure of the Periodic Table is open to debate.