Periodic Table of Elements

02/05/09

Kr

Krypton

Atomic Number

36

Atomic Symbol

Kr

	Name	Krypton
	Meaning	Name is from the Greek word 'kryptos' meaning 'hidden'

Group

Noble gases

Atomic Weight

83.798

Density, g/cubic cm at STP

0.003733

Melting Point, °C

-157.22

Boiling Point, °C, 1 atm

-152

Naturally Occurring Isotopes

Kr-78, -80, -82, -83, -84, -86

Discoverer

Ramsay and Travers

Year

1898

Ionization Energy, eV

13.9996

Configuration

[Ar] 3d10 5s2 5p6

Description

Colorless, odorless gas at STP

Information Krypton is NOT what gave Superman his powers, that's Kryptonite, a fictional radioactive metal. Instead, Krypton is an unreactive noble gas found in trace amounts in the atmosphere. In a vacuum discharge tube it glows in a yellow-green color. Joseph's Element Collection Joseph has not yet obtained a sample of Krypton. 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