Praseodymium - Pr

Gwendolyn Rearich

Properties

This element's density is 6.640 g/cc. At room temperature praseodymium is a soft, solid, silver metal. Praseodymium is somewhat resistant to air corrosion. At 931°C (1,708°F) this element starts to melt. At 3,290°C (5,954°F) this element has vaporized. Its high melting and boiling points contribute to what this element's real world uses are.

Praseodymium has no biological role and is not present in humans, but is low in toxicity.

Atomic Structure

Praseodymium has an atomic number of 59, an atomic radius of 247 pm, a mass number of 141, and a number of 82 neutrons. The most common isotope of praseodymium is 141Pr. Praseodymium is located under the rare-earth and lanthanide elements on the Periodic Table.

People Leading to Praseodymium's Discovery

Praseodymium got its name form the Greek words "prasios didymos" meaning green twin because it develops a green coating when exposed to air and was discovered at the same time as neodymium.

Uses

Praseodymium's two most common uses are to color glasses, enamels, and glazes a yellow color and to combine with neodymium to form didymium glass to filter out the infrared light of fire so glassblowers can see their work better. When combined with alloys, praseodymium other uses are for much more than just glass. Praseodymium combined with magnesium is used in aircraft engines. Mischmetal, containing 5% of praseodymium, is used to make flint in lighters. Praseodymium is used in certain alloys to make permanent magnets. Praseodymium is used in studio lighting and projection when combined with carbon arc electrodes.
Didymium Glasses for Glass Blowing

Praseodymium is found in monazite and bastnaesite. These materials are mosty located in China.

Bibliography

- Element Card: Gray, Theodore W. (2008). The Photographic Card Deck of the Elements.

- Elements Book: Gray, Theodore W. (2009). The Elements: A visual exploration of every known atom in the universe. New York: Black Dog & Leventhal Publishers, Inc.

- “Praseodymium.” Los Alamos National Library, N.p., n.d. Web. 21 Dec. 2015. http://periodic.lanl.gov/59.shtml.

- “Praseodymium.” Royal Science of Chemistry, N.p., n.d. Web. 21 Dec. 2015. http://www.rsc.org/periodic-table/element/59/praseodymium.

- "Didymium Glasses for Glass Blowing." teralabUK. YouTube. 29 Sept. 2009.