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Basic Information

Name: Osmium
Symbol: Os
Atomic Number: 76
Atomic Mass: 190.23 amu
Melting Point: 3045.0 °C (3318.15 K, 5513.0 °F)
Boiling Point: 5027.0 °C (5300.15 K, 9080.6 °F)
Number of Protons/Electrons: 76
Number of Neutrons: 114
Classification: Transition Metal
Crystal Structure: Hexagonal
Density @ 293 K: 22.4 g/cm³
Color: silvery

Atomic Structure

Number of Energy Levels: 6

First Energy Level:

Second Energy Level:

Third Energy Level:

Fourth Energy Level:

Fifth Energy Level:

Sixth Energy Level:

Isotopes

Isotope	Half Life
Os-184	Stable
Os-185	93.6 days
Os-186	2.0E15 years
Os-187	Stable
Os-188	Stable
Os-189	Stable
Os-190	Stable
Os-190m	9.9 minutes
Os-191	15.4 days
Os-191m	13.1 hours
Os-192	Stable
Os-193	30.5 hours
Os-194	6.0 years

Facts

Date of Discovery: 1803
Discoverer: Smithson Tenant
Name Origin: From the Greek word osm� (odor)
Uses: tip gold pen points, instrument pivots, electrical light filaments
Obtained From: ores that contain platinum

MLA Format for Citing This Page

Bentor, Yinon. Chemical Element.com - Osmium. <http://www.chemicalelements.com/elements/os.html>.

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