Comparison of Bromine and Iodine

Attribute	Iodine ×	Bromine ×
Atomic mass (u)	126.9045	79.9
Standard state	Solid	Liquid
Oxidation states	-1 +1 +5 +7	-1 +1 +5
Electron configuration	[Kr]5s²4d¹⁰5p⁵	[Ar]4s²3d¹⁰4p⁵
Atomic radius (van der waals) (pm)	198	183
Electronegativity (pauling scale)	2.66	2.96
Electron affinity (eV)	3.059	3.365
Ionization energy (eV)	10.451	11.814
Boiling point (K)	457.55	331.95
Melting point (K)	386.85	265.95
Density (g/cm³)	4.93	3.11
Atomic number	53	35
Group name	Halogen	Halogen
Discovered (year)	1811	1826
Symbol	I	Br