Template:Infobox iodine

	child table, as reused in {IB-I} v; e; h;
Main isotopes of iodine

Iodine, ₅₃I
	File:Sample of iodine.jpg
Iodine
Pronunciation	/ˈaɪədaɪn, -dɪn, -diːn/ (EYE-ə-dyne, -⁠din, -⁠deen)
Appearance	lustrous metallic gray solid, black/violet liquid, violet gas
Standard atomic weight Ar°(I)
	126.90447±0.00003; 126.90±0.01 (abridged);
Iodine in the periodic table
	tellurium ← iodine → xenon
Atomic number (Z)	53
Group	group 17 (halogens)
Period	period 5
Block	p-block
Electron configuration	[Kr] 4d10 5s2 5p5
Electrons per shell	2, 8, 18, 18, 7
Physical properties
Phase at STP	solid
Melting point	(I2) 386.85 K (113.7 °C, 236.66 °F)
Boiling point	(I2) 457.4 K (184.3 °C, 363.7 °F)
Density (at 20° C)	4.944 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
Heat of vaporization	(I2) 41.57 kJ/mol
Molar heat capacity	(I2) 54.44 J/(mol·K)
Atomic properties
Oxidation states	common: −1, +1, +3, +5, +7; +2, +4,? +6?
Electronegativity	Pauling scale: 2.66
Ionization 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
	Color lines in a spectral rangeSpectral lines of iodine
Other properties
Natural occurrence	primordial
Crystal structure	base-centered orthorhombic (oS8)
Lattice constants	Base-centered orthorhombic crystal structure for iodinea = 725.79 pm; b = 478.28 pm; c = 982.38 pm (at 20 °C)
Thermal expansion	74.9×10−6/K (at 20 °C)
Thermal conductivity	0.449 W/(m⋅K)
Electrical resistivity	1.3×107 Ω⋅m (at 0 °C)
Magnetic ordering	diamagnetic
Molar 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)
Isotopes of iodine v; e;
	File:Symbol category class.svg Category: Iodine; view; talk; edit; \| references

I · Iodine
Te ← ibox Te	^iso ₅₃I [e] IB-I [e] IBisos [e]	→ Xe ibox Xe
File:Symbol category class.svg cat:I (0) File:Symbol category class.svg cat:I-isotopes (0) File:Commons-logo.svg Commons File:Wikidata-logo.svg Wikidata:Q1103 File:Wiktionary-logo.svg Wiktionary
indexes by PT (page) v e

Data sets read by {{Infobox element}}
Name and identifiers	view edit
Symbol etymology (11 non-trivial)	view edit
Top image (caption, alt)	caption: view edit alt: view edit
Pronunciation	view edit
Allotropes (overview)	view edit
Group (overview)	view edit
Period (overview)	view edit
Block (overview)	view edit
Natural occurrence	view edit
Phase at STP	view edit
Oxidation states	view edit
Spectral lines image	view edit
Electron configuration (cmt, ref)	view edit
Isotopes
Standard atomic weight	view edit
most stable isotope	view edit
File:Notification-icon-Wikidata-logo.svg Wikidata
Wikidata *	view edit
* Not used in {{Infobox element}} (2023-01-01) See also {{Index of data sets}} · Cat:data sets (0) · (this table: v )

Notes

↑ The thermal expansion of crystalline iodine is anisotropic: the parameters (at 20 °C) for each axis are α_a = 86.5×10⁻⁶/K, α_b = 126×10⁻⁶/K, α_c = 12.3×10⁻⁶/K, and α_average = α_V/3 = 74.9×10⁻⁶/K.^[3]

References

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[5] The thermal expansion of crystalline iodine is anisotropic: the parameters (at 20 °C) for each axis are α_a = 86.5×10⁻⁶/K, α_b = 126×10⁻⁶/K, α_c = 12.3×10⁻⁶/K, and α_average = α_V/3 = 74.9×10⁻⁶/K.^[3]

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[6] Magnetic susceptibility of the elements and inorganic compounds, in Handbook of Chemistry and Physics 81st edition, CRC press.

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