My periodic table poster is now available! Element 111 does not occur in nature, and it has no isotopes that last long enough to allow significant quantities to be accumulated. It is essentially a laboratory curiosity. Compare at other websites: periodictable.com Wikipedia WebElements Museum Display Minerals Translations and Etymology Science Fiction (Main Site) Comics Collections: Poster Samples Poster sample. This photograph of Wilhelm Roentgen appears in my Photographic Periodic Table Poster representing roentgenium, which is named after him. This highly unstable element can't reasonably be photographed, and a picture of its namesake seemed like a reasonable alternative. The sample photograph includes text exactly as it appears in the poster, which you are encouraged to buy a copy of. This photo is Copyright (c) The Nobel Foundation, used with permission. Source: Max Whitby of RGB Contributor: Max Whitby of RGB Acquired: 15 April, 2006 Price: Donated Size: 6" Purity: 0%    My periodic table poster is now available!