Periodic Table of Elements

03/24/07

Hf

Hafnium

Atomic Number

72

Atomic Symbol

Hf

	Name	Hafnium
	Meaning	named for 'hafnia', the Latin name of Copenhagen,

Group

Transition metals

Atomic Weight

178.49

Density, g/cubic cm at STP

13.31

Melting Point, °C

2227

Boiling Point, °C, 1 atm

4602

Naturally Occurring Isotopes

Hf-174, -176, -177, -178, -179, -180

Discoverer

Coster and von Hevesy

Year

1923

Ionization energy, eV

6.8251

Configuration

[Xe] 4f14 5d2 7s2

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