← Back to periodic table
Krypton (Kr)
Atomic number: 36 · Category: noble gas · Group 18 · Period 4 · Phase: Gas
Krypton (from Greek:κρυπτός kryptos "the hidden one") is a chemical element with symbol Kr and atomic number 36. It is a member of group 18 (noble gases) elements. A colorless, odorless, tasteless noble gas, krypton occurs in trace amounts in the atmosphere, is isolated by fractionally distilling liquefied air, and is often used with other rare gases in fluorescent lamps.
Atomic mass: 83.7982
Density: 3.749
Melting point: 115.78 K
Boiling point: 119.93 K
Appearance: colorless gas, exhibiting a whitish glow in a high electric field
Source: Wikipedia
Block: p
CPK color:#5cb8d1
Electronic structure
Electron configuration: 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6
Configuration (semantic): [Ar] 3d10 4s2 4p6
Shells: 2, 8, 18, 8
Electronegativity (Pauling): 3
Electron affinity: -96
Ionization energies: 1350.8, 2350.4, 3565, 5070, 6240, 7570, 10710, 12138, 22274, 25880, 29700, 33800, 37700, 43100, 47500, 52200, 57100, 61800, 75800, 80400, 85300, 90400, 96300, 101400, 111100, 116290, 282500, 296200, 311400, 326200
Periodic position
Group: 18
Period: 4
xpos: 18
ypos: 4
Spectral/Bohr images
Image
3D Model