Oganesson (Og)

Oganesson is a chemical element with symbol Og and atomic number 118. It is named after the Russian nuclear physicist Yuri Oganessian. As a synthetic element, it can be created in a laboratory but is not found in nature.

Atomic Number

118

Atomic Mass

294 u

Category

noble gas

Phase

Predicted solid

Density

~5.0 (predicted) g/cm³

Electron Shells

2, 8, 18, 32, 32, 18, 8

Atomic Structure

Protons: 118 • Electrons: 118 • Neutrons: Varies by isotope

Electron Configuration: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 6s² 4f¹⁴ 5d¹⁰ 6p⁶ 7s² 5f¹⁴ 6d¹⁰ 7p⁶

Discovery

2002 • Yuri Oganessian, Ken Moody