Osmium

Images

Image

Attribution: Alchemist-hp

Animated Osmium

History

Discovered in 1803 by Tennant in the residue left when crude platinum is dissolved by aqua regia.

Sources

Osmium occurs in iridosule and in platinum-bearing river sands in the Urals, North America, and South America. It is also found in the nickel-bearing ores of Sudbury, Ontario region along with other platinum metals. While the quantity of platinum metals in these ores is very small, the large tonnages of processed nickel ores make commercial recovery possible.

Uses

The tetroxide has been used to detect fingerprints and to stain fatty tissue for microscope slides. The metal is almost entirely used to produce very hard alloys with other metals of the platinum group for fountain pen tips, instrument pivots, phonograph needles, and electrical contacts.

General Info

AtomicNumber
76
Symbol
Os
Name
Osmium

Atomic Info

Appearance
AtomicWeight
190.23(3)
Color
266696
ElectronicConfiguration
[Xe] 4f14 5d6 6s2
ElectronegativityInPauling
2.2
AtomicRadiusInPM
128
IonRadiusInPM
63 (+4)
VanDerWaalsRadiusInPM
IEinKJmol
840
EAinKJmol
-106
OxidationStates
-2, -1, 1, 2, 3, 4, 5, 6, 7, 8
StandardState
solid
BondingType
metallic
MeltingPoint
3306
BoilingPoint
5285
Density
22.59
State
Transition metal
DiscoveredYear
1803