Template:Infobox iodine

Iodine,  ₅₃I

Template:Infobox element/symbol-to-top-image-caption
General properties
Pronunciation	Template:Infobox element/pronunciation
Appearance	lustrous metallic gray, violet as a gas
Standard atomic weight (Ar, standard)	Template:Infobox element/standard atomic weight
Mass number	Template:Infobox element/symbol-to-most-stable-isotope (most stable isotope)
Iodine in the periodic table
Template:Infobox element/periodic table
Atomic number (Z)	53
Group	Template:Infobox element/group
Period	period 5
Block	p-block
Element category	Template:Infobox element/category format
Electron configuration	[Kr] 4d10 5s2 5p5
Electrons per shell	2, 8, 18, 18, 7
Physical properties
Phase at STP	solid
Melting point	386.85 K ​(113.7 °C, ​236.66 °F)
Boiling point	457.4 K ​(184.3 °C, ​363.7 °F)
Density (near r.t.)	4.933 g/cm3
Triple point	386.65 K, ​12.1 kPa
Critical point	819 K, 11.7 MPa
Heat of fusion	(I2) 15.52 kJ/mol
[[Enthalpy of vaporization|Heat of Template:Engvar]]	(I2) 41.57 kJ/mol
Molar heat capacity	(I2) 54.44 J/(mol·K)
[[Vapor pressure|Template:Engvar pressure]] (rhombic) Template:Infobox element/vapor pressure table
Atomic properties
Oxidation states	Template:Infobox element/symbol-to-oxidation-state
Electronegativity	Pauling scale: 2.66
[[Ionization energy|Template:Engvar energies]]	1st: 1008.4 kJ/mol 2nd: 1845.9 kJ/mol 3rd: 3180 kJ/mol
Atomic radius	empirical: 140 pm
Covalent radius	139±3 pm
Van der Waals radius	198 pm
Template:Infobox element/spectral lines
Other properties
Crystal structure	​Template:Infobox element/crystal structure Template:Infobox element/crystal structure
Thermal conductivity	0.449 W/(m·K)
Electrical resistivity	1.3×107 Ω·m (at 0 °C)
Magnetic ordering	diamagnetic
Magnetic susceptibility	−88.7·10−6 cm3/mol (298 K)
Bulk modulus	7.7 GPa
CAS Number	7553-56-2
History
Discovery and first isolation	Bernard Courtois (1811)
Main isotopes of iodine
Template:Infobox element/isotopes table