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Periodic Table of Elements

 

02/05/09

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Periodic Table


Ir

Iridium

Atomic Number 77

Atomic Symbol Ir

Name Iridium
  Meaning Named for Iris, the Latin goddess of rainbows, because it forms colored compounds

Group Transition metals

Atomic Weight 192.217

Density, g/cubic cm at STP 22.650

Melting Point, °C 2443

Boiling Point, °C, 1 atm 4130

Naturally Occurring Isotopes Ir-191, Ir-193

Discoverer Tennant/Collet-Descotils

Year 1803

Ionization Energy, eV 8.967

Configuration [Xe] 4f14 5d7 6s2

Description Silvery-white

   

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

 


 

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