General: |
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Name: Iodine
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Symbol: I
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Group: Halogen
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Atomic weight: 126.9045
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Density @ 293 K: 4.93 g/cm3
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Atomic volume: 25.74 cm3/mol
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Group: Halogen
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discovered: 1811
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States: |
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state (s, l, g): s
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melting point: 386.7 K
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boiling point: 458.4 K
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Heat of fusion: 7.824 kJ/mol
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Heat of vaporization: 20.752 kJ/mol
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Energies: |
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1st ionization energy: 1008.4 kJ/mole
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electronegativity: 2.66
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2nd ionization energy: 1845.8 kJ/mole
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electron affinity: 295.16 kJ/mole
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3rd ionization energy: 3184 kJ/mole
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Specific heat: 0.214 J/gK
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heat atomization: 107 kJ/mole atoms
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Oxidation & Electrons: |
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Shells: 2,8,18,18,7
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electron configuration: [Kr] 4d10 5s2 5p5
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minimum oxidation number: -1
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maximum oxidation number: 7
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min. common oxidation no.: 0
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max. common oxidation no.: 7
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Appearance & Characteristics: |
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structure: layers of I2
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color: bluish-black
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uses: nutrient, antiseptic
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toxicity: yes
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hardness: mohs
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characteristics: diatomic
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Reactions: |
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reaction with air: none
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reaction with 6M HCl: none
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reaction with 6M HCl: none
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reaction with 15M HNO3: mild, =>HIO3
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reaction with 6M NaOH: mild, =>OI-, I-
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Other Forms: |
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number of isotopes: 1
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hydride(s): HI
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oxide(s): I2O5 I4O9 I2O4
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chloride(s): ICl ICl3
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Radius: |
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ionic radius (2- ion): pm
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ionic radius (1- ion): 206 pm
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atomic radius: 133 pm
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ionic radius (1+ ion): pm
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ionic radius (2+ ion): pm
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ionic radius (3+ ion): pm
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Conductivity: |
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thermal conductivity: 0.45 J/m-sec-deg
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electrical conductivity: 0 1/mohm-cm
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polarizability: 5 A^3
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Abundance: |
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source: Brines, Chilean nitrate (misc)
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rel. abund. solar system: -0.046 log
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abundance earth's crust: -0.3 log
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cost, pure: 8.3 $/100g
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cost, bulk: $/100g
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