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Transcript of Praseodymium
140.91 Atomic mass Atomic number Chemical Symbol Block in Periodic Table: f- block Classification: Metallic Bibliography www.webelements.com/praseodymium/ Isotopes Isotope Atomis mass:
4.136 Praseodymium name came from? The name originates from the Greek words 'prasios' meaning green and 'didymos' meaning twin. Historical Background Found by the Austrian Chemist Baron Aver von Welsbach in 1885. can be found in houses in equipment such as colour televisions, fluorescent lamps, energy-saving lamps and glasses Where is it found? praseodymium is found in monazite and bastnasite http://www.facts-about.org.uk/science-element-praseodymium.htm Obtained It is obtained through an iron exchange process form monazite sand. http://education.jlab.org/itselemental/ele059.html Description of Praseodymium Soft silverish Malleable Ductile Turns a green color that "spolls" away when exposed to air. How its used used in cigarettes lighter flints known for its ability to give glass a nice yellow colour used in the goggles which protect the eyes of welders How much does it cost? About $5 per pound How is it stored? Its stored under an inert atmosphere or under mineral oil or petroleum http://environmentalchemistry.com/yogi/periodic/Pr.html Physical Properties State: Solid
Density: 6.77 grams Per cubic centimeter
Boiling Point: 3739 K (3520*C or 6368*F)
Melting Point: 1204 K (931*C or 1708*F)
It is Ductile.
It is Brittle.
It is insoluble in water.
Radioactivity: 15 isotopes in praseodymium are known to be radioactive. Hazards praseodymium is of low to moderate toxicity mostly dangerous in the working environment can cause lung embolisms can be a threat to the liver when it accumulates in the human body ~Not so~ interesting facts Praseodymium is a typical metal, somewhat similar to aluminum, iron, or magnesium. It is quite expensive to prepare and does not have many practical uses. The original "discovery" of a "new" element called didymium turned out to be a mixture of neodymium and praseodymium.