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Periodic Table of Elements

 

02/05/09

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Periodic Table


Th

Thorium

Atomic Number 90

Atomic Symbol Th

Name Thorium
  Meaning Named for Thor, the Norse god of thunder

Group Rare earth

Atomic Weight 232.0381

Density, g/cubic cm at STP 11.72

Melting Point, °C 1755

Boiling Point, °C, 1 atm 4787

Naturally Occurring Isotopes Th-230, Th-232

Discoverer Berzelius

Year 1828

Ionization Energy, eV 6.3067

Configuration [Rn] 6d2 7s2

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

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

This site was last updated 10/14/05