Periodic Table of Elements

03/24/07

Ca

Calcium

Atomic Number

20

Atomic Symbol

Ca

	Name	Calcium
	Meaning	Name comes from the Latin word 'calx' meaning 'limestone'

Group

Alkaline earth

Atomic Weight

40.078

Density, g/cubic cm at STP

1.54

Melting Point, °C

839

Boiling Point, °C, 1 atm

1487

Naturally Occurring Isotopes

Ca-40, -42, -43, -44, -46, -48

Discoverer

Davy

Year

1808

Ionization Energy, eV

6.1132

Configuration

[Ar] 4s2

Description

Silvery-white metal

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