Comparison of Bromine and Krypton

Attribute	Krypton ×	Bromine ×
Atomic mass (u)	83.8	79.9
Standard state	Gas	Liquid
Oxidation states	0	-1 +1 +5
Electron configuration	[Ar]4s²3d¹⁰4p⁶	[Ar]4s²3d¹⁰4p⁵
Atomic radius (van der waals) (pm)	202	183
Electronegativity (pauling scale)	3	2.96
Electron affinity (eV)	-	3.365
Ionization energy (eV)	14	11.814
Boiling point (K)	119.93	331.95
Melting point (K)	115.79	265.95
Density (g/cm³)	0.003733	3.11
Atomic number	36	35
Group name	Noble gas	Halogen
Symbol	Kr	Br
Discovered (year)	1898	1826