Iodine element properties

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Name: Iodine Symbol: I
Group: Halogen Atomic weight: 126.9045
Density @ 293 K: 4.93 g/cm3 Atomic volume: 25.74 cm3/mol
Group: Halogen discovered: 1811


state (s, l, g): s
melting point: 386.7 K boiling point: 458.4 K
Heat of fusion: 7.824 kJ/mol Heat of vaporization: 20.752 kJ/mol


1st ionization energy: 1008.4 kJ/mole
electronegativity: 2.66 2nd ionization energy: 1845.8 kJ/mole
electron affinity: 295.16 kJ/mole 3rd ionization energy: 3184 kJ/mole
Specific heat: 0.214 J/gK heat atomization: 107 kJ/mole atoms

Oxidation & Electrons:

Shells: 2,8,18,18,7 electron configuration: [Kr] 4d10 5s2 5p5
minimum oxidation number: -1 maximum oxidation number: 7
min. common oxidation no.: 0 max. common oxidation no.: 7

Appearance & Characteristics:

structure: layers of I2 color: bluish-black
uses: nutrient, antiseptic toxicity: yes
hardness: mohs characteristics: diatomic


reaction with air: none
reaction with 6M HCl: none reaction with 6M HCl: none
reaction with 15M HNO3: mild, =>HIO3 reaction with 6M NaOH: mild, =>OI-, I-

Other Forms:

number of isotopes: 1 hydride(s): HI
oxide(s): I2O5 I4O9 I2O4 chloride(s): ICl ICl3


ionic radius (2- ion): pm ionic radius (1- ion): 206 pm
atomic radius: 133 pm ionic radius (1+ ion): pm
ionic radius (2+ ion): pm ionic radius (3+ ion): pm


thermal conductivity: 0.45 J/m-sec-deg
electrical conductivity: 0 1/mohm-cm polarizability: 5 A^3


source: Brines, Chilean nitrate (misc)
rel. abund. solar system: -0.046 log abundance earth's crust: -0.3 log
cost, pure: 8.3 $/100g cost, bulk: $/100g

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