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Periodic Table of Elements

 

02/05/09

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Periodic Table


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

 

  Copyright 2005, Kelley Whitley, ChemProfessor. All rights reserved.

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