promethium

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Chemical equations Chemical reactions chemistry

How Do You Balance a Chemical Equation?

Illustration of molecules. (molecular, chemistry, science)

Why Is a Group of Molecules Called a Mole?

Above the clouds 130 nautical miles below, astronaut Mark C. Lee floats freely without tethers as he tests the new Simplified Aid for Extravehicular Activity (EVA) Spacewalk Rescue (SAFER) system, Sept. 16, 1994. Space Shuttle Discovery, STS-64

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Leonardo da Vinci (1452-1519), Italian Renaissance painter from Florence. Engraving by Cosomo Colombini (d. 1812) after a Leonardo self portrait. Ca. 1500.

10 Famous Artworks by Leonardo da Vinci

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The Jeff Koons tulips sculputure outside the Guggenheim Museums in Bilbao, Spain, Basque Country.

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pg 229Nazi parade features a banner proclaiming, "Death to Marxism."The possibility of a peaceful Germany after World War I was precluded entirely by the terms of the Versailles Treaty and theintransigent hostility of France and England. Stripped of indu

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Adolf Hitler (Nazi, nazism, German leader).

9 Things You Might Not Know About Adolf Hitler

Shoebill. A Shoebill Stork (Balaeniceps rex), aka 'Whalehead' standing in shallow marsh. Resides in tropical East Africa. A very large bird related to the storks. It derives its name from its massive shoe-shaped bill.

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Aphrodite. Greek mythology. Sculpture. Aphrodite is the Greek goddess of love and beauty.

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promethium: References & Edit History

More Articles On This Topic

Assorted References

rare-earth elements
- In rare-earth element: Discovery and history

Article Contributors

Primary Contributors

The Editors of Encyclopaedia Britannica

Other Contributors

Karl A. Gschneidner, Jr.
Anson Marston Distinguished Professor, Ames Laboratory, Iowa State University, Ames, Iowa.
Vitalij K. Pecharsky
Distinguished Professor, Ames Laboratory, Iowa State University, Ames, Iowa.

Other Encyclopedia Britannica Contributors

Article History

Type	Description	Contributor	Date
	Added media.	Rick Livingston	Mar 01, 2024
	Modified link of Web site: Live Science - Facts About Promethium.	Emily Rodriguez	Jun 23, 2022
	Add new Web site: National Center for Biotechnology Information - PubChem - Promethium.	Emily Rodriguez	May 24, 2021
	Add new Web site: Live Science - Facts About Promethium.	Thinley Kalsang Bhutia	Feb 20, 2017
	Add new Web site: Chemicool - Promethium.	Grace Young	Apr 28, 2014
	Add new Web site: WebElements - Promethium.	Grace Young	Apr 28, 2014
	Article revised jointly with Vitalij K. Pecharsky.	Erik Gregersen Karl A. Gschneidner, Jr.	Oct 02, 2012
	Article revised jointly with Karl A. Gschneidner, Jr.	Erik Gregersen Vitalij K. Pecharsky	Oct 02, 2012
	Article revised and updated.	Richard Pallardy	Apr 17, 2009
	Added new Web site: Chemical Elements.com - Promethium.	Grace Young	Jun 09, 2008
	Added new Web site: Lenntech - Promethium.	Grace Young	Jun 09, 2008
	Added new Web site: Los Alamos National Laboratory - Promethium.	Grace Young	Jun 09, 2008
	Added new Web site: EnvironmentalChemistry.com - Promethium.	Grace Young	Jun 09, 2008
	Added new Web site: Royal Society of Chemistry - Promethium.	Grace Young	Jun 09, 2008
	Article added to new online database.	The Editors of Encyclopaedia Britannica	Jul 20, 1998