The periodic table of the elements by WebElements You can buy this periodic table poster and more at the WebElements periodic table shop On 1 May 2014 a paper published in Phys Rev Lett by J Khuyagbaatar and others states the superheavy element with atomic number Z = 117 (ununseptium) was produced as an evaporation residue in the 48 Ca and 249 Bk fusion reaction at the gas-filled recoil