Xenon (Xe)

Xenon is a chemical element with symbol Xe and atomic number 54. It is a colorless, dense, odorless noble gas found in the Earth's atmosphere in trace amounts.

Atomic Number

54

Atomic Mass

131.29 u

Category

noble gas

Phase

gas

Density

0.005894 g/cm³

Electron Shells

2, 8, 18, 18, 8

Atomic Structure

Protons: 54 • Electrons: 54 • Neutrons: Varies by isotope

Electron Configuration: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶

Discovery

1898 • William Ramsay, Morris Travers