Symbol Name Atomic Number Atomic Weight Group Number
Uuo Ununoctium 118 293 18


Standard State: Presumably a solid at 298 K
Color: Unknown, but probably metallic and silvery white or gray in appearance

Three atoms of element 118 (ununoctium, Uuo) were synthesized by fusing krypton-86 with lead-208 in experiments conducted at at The Lawrence Berkeley National Laboratory, Berkeley, The University of California, and Oregon State University, Corvallis. It is very short-lived and decomposes to element 116.

Elements 118 and 116 were identified by accelerating a beam of krypton-86 ions to an energy of 449 million electron volts and directing the beam onto targets of lead-208. After 11 days work, just three atoms of the new element were identified. The production rates for element 118 are approximately one in every 1012 interactions.