General: |
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Name: Iridium
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Symbol: Ir
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Group: Trans. Met.
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Atomic weight: 192.22
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Density @ 293 K: 22.42 g/cm3
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Atomic volume: 8.54 cm3/mol
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Group: Trans. Met.
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discovered: 1804
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States: |
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state (s, l, g): s
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melting point: 2683.2 K
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boiling point: 4823 K
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Heat of fusion: 26.10 kJ/mol
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Heat of vaporization: 604.0 kJ/mol
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Energies: |
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1st ionization energy: 880 kJ/mole
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electronegativity: 2.2
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2nd ionization energy: kJ/mole
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electron affinity: 151 kJ/mole
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3rd ionization energy: kJ/mole
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Specific heat: 0.130 J/gK
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heat atomization: 665 kJ/mole atoms
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Oxidation & Electrons: |
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Shells: 2,8,18,32,15,2
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electron configuration: [Xe] 4f14 5d7 6s2
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minimum oxidation number: -1
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maximum oxidation number: 6
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min. common oxidation no.: 0
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max. common oxidation no.: 4
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Appearance & Characteristics: |
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structure: fcc: face-centered cubic
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color: white
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uses: Pt/Ir sparkplugs
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toxicity:
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hardness: 6.25 mohs
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characteristics: hard, densest el, inert
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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: none
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reaction with 6M NaOH: none
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Other Forms: |
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number of isotopes: 2
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hydride(s): none
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oxide(s): IrO2
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chloride(s): IrCl3
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Radius: |
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ionic radius (2- ion): pm
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ionic radius (1- ion): pm
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atomic radius: 136 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): 82 pm
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Conductivity: |
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thermal conductivity: 147 J/m-sec-deg
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electrical conductivity: 188.679 1/mohm-cm
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polarizability: 7.6 A^3
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Abundance: |
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source: nickel ores (sulfides)
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rel. abund. solar system: -0.180 log
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abundance earth's crust: -3 log
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cost, pure: 4200 $/100g
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cost, bulk: $/100g
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