Iridium element properties

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Name: Iridium Symbol: Ir
Group: Trans. Met. Atomic weight: 192.22
Density @ 293 K: 22.42 g/cm3 Atomic volume: 8.54 cm3/mol
Group: Trans. Met. discovered: 1804


state (s, l, g): s
melting point: 2683.2 K boiling point: 4823 K
Heat of fusion: 26.10 kJ/mol Heat of vaporization: 604.0 kJ/mol


1st ionization energy: 880 kJ/mole
electronegativity: 2.2 2nd ionization energy: kJ/mole
electron affinity: 151 kJ/mole 3rd ionization energy: kJ/mole
Specific heat: 0.130 J/gK heat atomization: 665 kJ/mole atoms

Oxidation & Electrons:

Shells: 2,8,18,32,15,2 electron configuration: [Xe] 4f14 5d7 6s2
minimum oxidation number: -1 maximum oxidation number: 6
min. common oxidation no.: 0 max. common oxidation no.: 4

Appearance & Characteristics:

structure: fcc: face-centered cubic color: white
uses: Pt/Ir sparkplugs toxicity:
hardness: 6.25 mohs characteristics: hard, densest el, inert


reaction with air: none
reaction with 6M HCl: none reaction with 6M HCl: none
reaction with 15M HNO3: none reaction with 6M NaOH: none

Other Forms:

number of isotopes: 2 hydride(s): none
oxide(s): IrO2 chloride(s): IrCl3


ionic radius (2- ion): pm ionic radius (1- ion): pm
atomic radius: 136 pm ionic radius (1+ ion): pm
ionic radius (2+ ion): pm ionic radius (3+ ion): 82 pm


thermal conductivity: 147 J/m-sec-deg
electrical conductivity: 188.679 1/mohm-cm polarizability: 7.6 A^3


source: nickel ores (sulfides)
rel. abund. solar system: -0.180 log abundance earth's crust: -3 log
cost, pure: 4200 $/100g cost, bulk: $/100g

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