Iridium

Images

Image

Attribution: images-of-elements.com

Animated Iridium

History

From the Latin word iris meaning rainbow. Tennant discovered iridium in 1803 in the residue left when crude platinum is dissolved by aqua regia. The name iridium is appropriate because its salts are highly colored.

Sources

Iridium occurs uncombined in nature with platinum and other metals of this family in alluvial deposits. It is recovered as a by-product from the nickel mining industry.

Uses

Although its principal use is as a hardening agent for platinum, iridium is also used to make crucibles and devices requiring high temperatures. It is also used for electrical contacts.

The element forms an alloy with osmium which is used for tipping pens and compass bearings.

General Info

AtomicNumber
77
Symbol
Ir
Name
Iridium

Atomic Info

Appearance
AtomicWeight
192.217(3)
Color
175487
ElectronicConfiguration
[Xe] 4f14 5d7 6s2
ElectronegativityInPauling
2.2
AtomicRadiusInPM
137
IonRadiusInPM
68 (+3)
VanDerWaalsRadiusInPM
IEinKJmol
880
EAinKJmol
-151
OxidationStates
-3, -1, 1, 2, 3, 4, 5, 6
StandardState
solid
BondingType
metallic
MeltingPoint
2739
BoilingPoint
4701
Density
22.56
State
Transition metal
DiscoveredYear
1803