Iodine - Iodium

Symbol	I
Latin name	Iodium
Atomic number	53
Period	5
Element category	Halogens
Relative atomic mass	126.90447
Group	VII.A
Electronegativity	2.5
Oxidation numbers	-1, 1, 3, 5, 7
Electron configuration	1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 5s² 5p⁵
Density [g/cm³]	4.93
State	Solid
Melting point [°C]	113.5
Boiling point [°C]	184.35
Critical point [°C]	546
Critical pressure [MPa]	11.7
Atomic radius [pm]	115
Covalent radius [pm]	133
Thermal conductivity [W m^-1K^-1]	0.449
Heat capacity [J K^-1g^-1]	0.145
Discovery	1811
Electrical conductivity [S m^-1]	1 · 10^-7
1.st ionization energy [eV]	10.4513
2.nd ionization energy [eV]	19.131
3.rd ionization energy [eV]	33.0
Stable isotopes	1
Unstable isotopes	23