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Periodic Table of Elements

 

02/05/09

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Periodic Table


Pr

Praseodymium

Atomic Number 59

Atomic Symbol Pr

Name Praseodymium
  Meaning Name derived from the Greek 'prasios' + 'didymos' meaning 'green twin'

Group Rare earth

Atomic Weight 140.90765

Density, g/cubic cm at STP  6.773

Melting Point, °C  931

Boiling Point, °C, 1 atm 3512

Naturally Occurring Isotopes Pr-141

Discoverer von Welsbach

Year 1885

Ionization Energy, eV 5.473

Configuration [Xe] 4f3 6s2

Description Yellowish silver

   

Information
Praseodymium is one of the longest and most complex names of all elements. It reacts with Oxygen to form a green oxide, which is where the name "green twin" comes from.

Joseph's Element Collection
Joseph has not yet obtained a sample of praseodymium.

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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