Periodic Table
36
Kr
83.798
Krypton
Noble GasForms few compounds (KrF₂); used in lighting.
Electronic Configuration
[Ar] 3d¹⁰ 4s² 4p⁶or1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶
Electron shells
2e⁻n=1
8e⁻n=2
18e⁻n=3
8e⁻n=4
Properties
Atomic number
36
Atomic mass
83.798 u
Category
Noble Gas
Block / Group / Period
p · 18 · 4
Valence electrons
8
Oxidation states
0, +2
Electronegativity
3
Atomic radius
88 pm
Ionization energy
1351 kJ/mol
Electron affinity
0 kJ/mol
Melting point
116 K / -157 °C
Boiling point
120 K / -153 °C
Density
0.003733 g/cm³
State at 25 °C
gas
Personal Notes
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