Krypton (Kr)

Krypton is a chemical element with symbol Kr and atomic number 36. It is a member of group 18 (noble gases) elements.

Atomic Number

36

Atomic Mass

83.798 u

Category

noble gas

Phase

gas

Density

0.003733 g/cm³

Electron Shells

2, 8, 18, 8

Atomic Structure

Protons: 36 • Electrons: 36 • Neutrons: Varies by isotope

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

Discovery

1898 • William Ramsay, Morris Travers