Comparison of Krypton and Radon

Attribute	Krypton ×	Radon ×
Standard state	Gas	Gas
Electron configuration	[Ar]4s²3d¹⁰4p⁶	[Xe]6s²4f¹⁴5d¹⁰6p⁶
Atomic mass (u)	83.8	222.01758
Electronegativity (pauling scale)	3	-
Oxidation states	0	0
Ionization energy (eV)	14	10.745
Atomic radius (van der waals) (pm)	202	220
Boiling point (K)	119.93	211.45
^1↑Melting point (K)	115.79	202
Density (g/cm³)	0.003733	0.00973
Atomic number	36	86
Group name	Noble gas	Noble gas
Symbol	Kr	Rn
Discovered (year)	1898	1900