Chemicool

I

53

126.9045
Iodine
General | States | Energies | Oxidation & Electrons |Appearance & Characteristics
Reactions | Other Forms |Radius | Conductivity | Abundance
Encyclopedia Britannica articles

General
Name Iodine Symbol I
atomic number 53 Atomic weight 126.9045
Density @ 293 K 4.93 g/cm3 Atomic volume 25.74 cm3/mol
Group Halogen discovered 1811

States
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
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Energies
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
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Appearance & Characteristics
structure layers of I2 color bluish-black
uses nutrient, antiseptic toxicity yes
hardness mohs characteristics diatomic

Reactions
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-
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Other Forms
number of isotopes 1 hydride(s) HI
oxide(s) I2O5 I4O9 I2O4 chloride(s) ICl ICl3

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

Abundance
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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