Osmium

Statistics:

• Name: Osmium
• Symbol: Os
• Classification: Transition Metal
• Atomic Number: 76
• Atomic Mass: 190.23 g/mol
• Density: 22.61 g/cm³
• Melting: 3045°C
• Boiling: 5027°C
• Protons & Electrons:76
• Neutrons:114
• Discovered: 1803
• Discovered By: Tennant
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Electrons Per Energy Level:

• Level 1: 2
• Level 2: 8
• Level 3: 18
• Level 4: 32
• Level 5: 14
• Level 6: 2

Isotopes:

Isotope: Half-life

• ¹⁸⁴Os: 5.6e13 years
• ¹⁸⁵Os: 93.6 d
• ¹⁸⁶Os: 2.0e15 years
• ¹⁸⁷Os: stable
• ¹⁸⁸Os: stable
• ¹⁸⁹Os: stable
• ¹⁹⁰Os: stable
• ^190m1Os: 9.9 minutes
• ¹⁹¹Os: 15.4 days
• ^191m1Os: 13.10 hours
• ¹⁹²Os: stable
• ¹⁹³Os: 30.11 hours
• ¹⁹⁴Os: 6.0 years

Brief Summary

Osmium is a Transition Metal with the symbol 'Os' and contains 76 Protons & Electrons with 114 neutrons in the nucleus of the atom. Osmium has an atomic mass of 190.23 g/mol and, at a temperature of 20°C, has a density of 22.61 g/cm³. It will melt at a temperature of 3045°C and boil at 5027°C.

Osmium was discovered by Tennant in 1803 and is named 'Osmium' Greek word "osmë" meaning "odor".

Some common usages for Osmium: tip gold pen points, instrument pivots, electrical light filaments.

Definitions and Notes

Density listed is at a temperature of 20°C.

Isotopes are forms of an element who have the same atomic number but different mass because they contain different number of neutrons.

Half-life is the time required for a quantity of a subject to fall to half of its current quantity.

MLA Citing Format

Osmium :: Os :: 76 - Chemical Element. 10 Mar. 2010 <http://www.chemicalelement.com/element/osmium.html>.