Periodic Table of Elements

02/05/09

Cr

Chromium

Atomic Number

24

Atomic Symbol

Cr

	Name	Chromium
	Meaning	Named for the Greek word 'chroma' meaning 'color' due to its many colored compounds

Group

Transition metals

Atomic Weight

51.9961

Density, g/cubic cm at STP

7.15

Melting Point, °C

1857

Boiling Point, °C, 1 atm

2642

Naturally Occurring Isotopes

Cr-50, -52, -53, -54

Discoverer

Vauquelin

Year

1797

Ionization Energy, eV

6.7665

Configuration

[Ar] 3d5 4s

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