Iridium Element Properties

Iridium

d76
Os
Osmium
d77
Ir
Iridium
d78
Pt
Platinum
General
Name(Iridium)
Symbol(Ir)
Number(77)
Group Number(9)
Group(Transition metals)
Block(d)
Density(22.42 g/cm3)
Atomic Weight(192.22 g/mol)
Atomic Volume(8.54 cm3/mol)
Discover(1804)


States
State(Solid)
Melting Point(2739 K)
Boiling Point(4701 K)
Triple Point(Nil)
Critical Point(Nil)
Heat of Fusion(41.12 kJ/mol)
Heat of Vaporization(563 kJ/mol)


Energies
First Ionization Energy(880 kJ/mole)
Second Ionization Energy(Nil)
Third Ionization Energy(Nil)
Electronegativity(2.2)
Electron Affinity(151 kJ/mole)
Specific Heat(0.130 J/gK)
Heat Atomization(665 kJ/mole atoms)


Oxidation and Electrons
Shells(2,8,18,32,15,2)
Electron Configuration([Xe] 4f14 5d7 6s2)
Minimum Oxidation Number(1)
Maximum Oxidation Number(6)
Minimum Common Oxidation Number(0)
Maximum Common Oxidation Number(4)


Appearance and Characteristics
Crystal Structure(cubic face centered)
Characteristics(hard, densest el, inert)
Color(white)
Uses(Pt/Ir sparkplugs)
Hardness(6.25 mohs)
Toxicity(None)


Reactions
Reaction with Air(None)
Reaction with 6M HCl(None)
Reaction with 15M HNO3(None)
Reaction with 6M NaOH(None)


Other Forms
Number of Isotopes(2)
Hydride(None)
Oxide(IrO2)
Chloride(IrCl3)


Radius
Atomic Radius(136 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 Conductivity(147 J/m-sec-deg)
Electrical Conductivity(188.679 1/mohm-cm)
Polarizability(7.6 A3)


Abundance
Source(nickel ores (sulfides))
Relation Abundance Solar System(-0.180 log)
Abundance Earths Crust(-3 log)


d76
Os
Osmium
d77
Ir
Iridium
d78
Pt
Platinum

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