Iridium

Symbol IrAtomic number 77
Atomic mass
192.22
Thermal conductivity
1.47
Atomic radius
1.87
Covalent radius
1.27
Density
22.4
Atomic volume
8.54
Melting point
2680
Oxidation states
2,3,4,6
Boiling point
4400
Stable isotopes
2
Heat of vapor.
604
Electronegativity
2.2
Heat of fusion
26.1
First ionization
9.1
Specific heat
0.130
Electrical conduct.
...
Electron configuration

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Iridium

Iridium is a metal of the platinum group. It is very unreactive and is sometimes alloyed with platinum to form a very hard alloy. Platinum-iridium is used for the tips of gold pens, and for surgical tools.

Iridium was brought into public discussion with the discovery of an iridium-rich layer in the strata of soil and rock which covers the entire planet. It is part of the evidence for an asteroid collision with the earth, widely associated with the extinction of the dinosaurs about 65 million years ago.

Atomic dataNuclear data
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Periodic Table

Chemistry concepts

Reference
Pauling
 
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Iridium Nuclear Data

Z
A
Atomic
Mass (u)
Nuclear
Mass(GeV/c2
Binding
Energy(MeV)
Spin
Natural
Abund.
Half-life
Decay
Q
MeV
77
189
188.958712
175.9760
1503.7
3/2
...
13.2d
EC
0.54
77
191
190.960584
177.8407
1518.1
3/2
0.373
stable
...
...
77
192
191.962580
178.7741
1524.3
4
...
73.83d
b-
1.45
77
193
192.962917
179.7059
1532.1
3/2
0.627
stable
...
...
Atomic data
Index

Periodic Table

Chemistry concepts

Reference
Rohlf
 
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