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Iridium Element Properties, Transition metals Group, Periodic Table of the Elements

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Iridium

Iridium Element Properties

d76
Os
Osmium
d77
Ir
Iridium
d78
Pt
Platinum
General
NameIridium
SymbolIr
Number77
Group Number9
GroupTransition metals
Blockd
Density22.42 g/cm3
Atomic Weight192.22 g/mol
Atomic Volume8.54 cm3/mol
Discover1804


States
StateSolid
Melting Point2739 K
Boiling Point4701 K
Triple PointNil
Critical PointNil
Heat of Fusion41.12 kJ/mol
Heat of Vaporization563 kJ/mol


Energies
First Ionization Energy880 kJ/mole
Second Ionization EnergyNil
Third Ionization EnergyNil
Electronegativity2.2
Electron Affinity151 kJ/mole
Specific Heat0.130 J/gK
Heat Atomization665 kJ/mole atoms


Oxidation and Electrons
Shells2,8,18,32,15,2
Electron Configuration[Xe] 4f14 5d7 6s2
Minimum Oxidation Number1
Maximum Oxidation Number6
Minimum Common Oxidation Number0
Maximum Common Oxidation Number4


Appearance and Characteristics
Crystal Structurecubic face centered
Characteristicshard, densest el, inert
Colorwhite
UsesPt/Ir sparkplugs
Hardness6.25 mohs
ToxicityNone


Reactions
Reaction with AirNone
Reaction with 6M HClNone
Reaction with 15M HNO3None
Reaction with 6M NaOHNone


Other Forms
Number of Isotopes2
HydrideNone
OxideIrO2
ChlorideIrCl3


Radius
Atomic Radius136 pm
Ionic Radius (1+ ion)Nil
Ionic Radius (1- ion)Nil
Ionic Radius (2+ ion)Nil
Ionic Radius (2- ion)Nil
Ionic Radius (3+ ion)82 pm


Conductivity
Thermal Conductivity147 J/m-sec-deg
Electrical Conductivity188.679 1/mohm-cm
Polarizability7.6 A3


Abundance
Sourcenickel ores (sulfides)
Relation Abundance Solar System-0.180 log
Abundance Earth's Crust-3 log


d76
Os
Osmium
d77
Ir
Iridium
d78
Pt
Platinum




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