Comparison of Krypton and Xenon

Attribute	Xenon ×	Krypton ×
Standard state	Gas	Gas
Electron configuration	[Kr]5s²4d¹⁰5p⁶	[Ar]4s²3d¹⁰4p⁶
Atomic mass (u)	131.29	83.8
Electronegativity (pauling scale)	2.6	3
Oxidation states	0	0
Ionization energy (eV)	12.13	14
Atomic radius (van der waals) (pm)	216	202
Boiling point (K)	165.03	119.93
Melting point (K)	161.36	115.79
Density (g/cm³)	0.005887	0.003733
Atomic number	54	36
Group name	Noble gas	Noble gas
Discovered (year)	1898	1898
Symbol	Xe	Kr