U1Un
U1Un, also known as Ununoctium, is a chemical element with the symbol Uuo and atomic number 118. It is the heaviest known element and is classified as a transactinide element in the periodic table. U1Un is a synthetic element, meaning it does not occur naturally and must be created in a laboratory setting.
The discovery of U1Un was announced in 2002 by a team of scientists from the Joint Institute
U1Un is expected to be a noble gas under standard conditions, similar to other elements in its
The name "Ununoctium" is a temporary systematic element name derived from the digits of its atomic number,