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Iodine (53I126.9045)
[7553-56-2]

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The least reactive of the halogens, iodine is a bluish-black, diatomics, lustrous solid, volatilizing at room temperature into a blue-violet gas with a distinctive odor. Iodine exhibits some metal-like properties. It is used in a wide variety of applications including dyes, photography, and medicines. It combines with many elements to form a variety of compounds.
Melting Point113.7°CBoiling Point185°C
Density4.93g/cm3Themal Conductivity10.4x10-4cal/cm2/cm/s/°C
Specific Heat @ 25°C0.052cal/g°CHeat of Fusion14.85cal/g
Heat of Vaporization39.28cal/gAtomic Volume25.7W/D
First Ionization Energy241K-cal/g-moleElectronegativity2.5Pauling's
Covalent Radius1.33AngstromsCubic Coefficient of Expansion @ 20°C2.81x10-6K-1
Electrical Resistivity @ 25°C5.85x106µΩ-cmCrystal StructureOrthorhombic
Critical Temperature553°CCritical Pressure116atm
Vapor Pressure @ 25°C0.31mmHg