Periodic Table of Elements

02/05/09

Os

Osmium

Atomic Number

76

Atomic Symbol

Os

	Name	Osmium
	Meaning	Named for the Greek word 'osme' for 'smell'

Group

Transition metals

Atomic Weight

190.23

Density, g/cubic cm at STP

22.610

Melting Point, °C

3027

Boiling Point, °C, 1 atm

5297

Naturally Occurring Isotopes

Os-184, -186, -187, -188, -189, -190, -192

Discoverer

Tennant

Year

1803

Ionization Energy, eV

8.4382

Configuration

[Xe] 4f14 5d6 6s2

Description

Lustrous blue-gray

Information Osmium and Iridium are the two densest elements at about 22.61g/cm3. Osmium was once used in phonograph needles. In powder form, Osmium reacts with Oxygen to produce the highly toxic Osmium Tertroxide. Joseph's Element Collection Joseph has not yet obtained a sample of Osmium. References: Holden, Norman E. (March 30, 2004). "History of the origin of the chemical elements and their discoverers." National Nuclear Data Center. Retrieved October 7, 2005 from http://www.nndc.bnl.gov/content/elements.html "List of elements by boiling point." (September 22, 2005). Wikipedia. Retrieved October 9, 2005 from http://en.wikipedia.org/wiki/List_of_elements_by_boiling_point "List of elements by density." (September 22, 2005). Wikipedia. Retrieved October 9, 2005 from http://en.wikipedia.org/wiki/List_of_elements_by_density "List of elements by melting point." (September 22, 2005). Wikipedia. Retrieved October 9, 2005 from http://en.wikipedia.org/wiki/List_of_elements_by_melting_point "NIST chemistry webBook." (2005). National Institute of Standards and Technology. Retrieved October 6, 2005 from http://webbook.nist.gov/chemistry/ Zucker, M.A.; Kishore, A. R.; Sukumar, R.; and Dragoset, R. A. (July 2005). "Elemental data index."  National Institute of Standards and Technology. Retrieved October 7, 2005 from http://physics.nist.gov/PhysRefData/Elements/cover.html