Which chemical element has the atomic number 118?

Oganesson is the chemical element with atomic number 118.

Its symbol is Og, and it is the heaviest element currently named on the periodic table. Oganesson belongs to group 18, the noble gases, although scientists expect its extreme mass to give it unusual properties.

The element was first reported by a collaboration involving scientists at the Joint Institute for Nuclear Research in Dubna, Russia, and Lawrence Livermore National Laboratory in the United States.

The name honors nuclear physicist Yuri Oganessian. The International Union of Pure and Applied Chemistry approved the name in 2016, replacing the temporary systematic name ununoctium.