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Iodine Element Properties, Halogen Group, Periodic Table of the Elements

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Iodine

Iodine Element Properties

p52
Te
Tellurium
p53
I
Iodine
p54
Xe
Xenon
General
NameIodine
SymbolI
Number53
Group Number17
GroupHalogen
Blockp
Density4.93 g/cm3
Atomic Weight126.9045 g/mol
Atomic Volume25.74 cm3/mol
Discover1811


States
StateSolid
Melting Point386.85 K
Boiling Point457.4 K
Triple PointNil
Critical Point819 K
Heat of Fusion15.52 kJ/mol
Heat of Vaporization41.57 kJ/mol


Energies
First Ionization Energy1008.4 kJ/mole
Second Ionization Energy1845.8 kJ/mole
Third Ionization Energy3184
Electronegativity2.66
Electron Affinity295.16 kJ/mole
Specific Heat0.214 J/gK
Heat Atomization107 kJ/mole atoms


Oxidation and Electrons
Shells2,8,18,18,7
Electron Configuration[Kr] 4d10 5s2 5p5
Minimum Oxidation Number-1
Maximum Oxidation Number7
Minimum Common Oxidation Number0
Maximum Common Oxidation Number7


Appearance and Characteristics
Crystal Structureorthorhombic
Characteristicsdiatomic
Colorbluish-black
Usesnutrient, antiseptic
HardnessNil
ToxicityYes


Reactions
Reaction with AirNone
Reaction with 6M HClNone
Reaction with 15M HNO3mild, =>HIO3
Reaction with 6M NaOHmild, =>OI-, I-


Other Forms
Number of Isotopes1
HydrideHI
OxideI2O5 I4O9 I2O4
ChlorideICl ICl3


Radius
Atomic Radius133 pm
Ionic Radius (1+ ion)Nil
Ionic Radius (1- ion)206 pm
Ionic Radius (2+ ion)Nil
Ionic Radius (2- ion)Nil
Ionic Radius (3+ ion)Nil


Conductivity
Thermal Conductivity0.45 J/m-sec-deg
Electrical Conductivity0 1/mohm-cm
Polarizability5 A3


Abundance
SourceBrines, Chilean nitrate (misc)
Relation Abundance Solar System-0.046 log
Abundance Earth's Crust-0.3 log


p52
Te
Tellurium
p53
I
Iodine
p54
Xe
Xenon




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