Comparison of Bromine and Iodine

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