Atomic Element Z = 36 • Noble Gas
Krypton (Kr) — Atomic Data, Electron Shells & Reactions
Krypton (symbol Kr, atomic number 36) has a standard atomic weight of 83.798 u and ground-state configuration [Ar] 3d10 4s2 4p6.
Atomic Number (Z)
36
IUPAC Symbol
Kr
Standard Atomic Weight
83.798 g/mol
Period / Group / Block
4 / 18 / p-block
Condensed Electron Config
[Ar] 3d10 4s2 4p6
Full Subshell Config
1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6
Principal Shell Occupancy
[2, 8, 18, 8]
Pauling Electronegativity
3
First Ionization Energy
1351 kJ/mol
Covalent Radius
116 pm
Melting Point
115.78 K (-157.37 °C)
Boiling Point
119.93 K (-153.22 °C)
Density
0.003733 g/cm³
Oxidation States
0, +2
Kr (Z=36) — Valence shell highlighted in vermilion