Periodic Table of Elements

03/24/07

Nb

Niobium

Atomic Number

41

Atomic Symbol

Nb

	Name	Niobium
	Meaning	Named for the character Niobe, daughter of Tantalus, from Greek drama

Group

Transition metals

Atomic Weight

92.90638

Density, g/cubic cm at STP

8.570

Melting Point, °C

2468

Boiling Point, °C, 1 atm

4742

Naturally Occurring Isotopes

Nb-93

Discoverer

Hatchett

Year

1801

Ionization Energy, eV

6.7589

Configuration

[Kr] 4d4 5s

Description

lustrous grey

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