Praseodymium

=Praseodymium=

= =


 * Atomic Number:**59


 * Protons:** 59 


 * Electrons 59** 


 * Neutrons:** 82


 * Average Atomic Mass:** 140.908 amu


 * Isotopes:** 137pr,138pr,139pr,140pr,142pr,143pr,144pr, 145pr


 * Discovery:****//Carl Auer//** was a quiet, industrious, unsociable boy from Austria who became a favorite student of Bunsen in Heidelberg. When Carl showed Bunsen a tiny handful of rare earth minerals he had collected from the north, Bunsen laughingly encouraged him to begin a study of them. Auer did so for the rest of his life. A number of chemists believed that Didymium was a mixture of elements but none had made a successful separation. In 1885 at age 26 Auer announced to the Vienna Academy of Sciences that by repeated fractionation of ammonium didymium nitrate, he had succeeded in splinting didymia into two earths.


 * Name:** it was named after Greek words  prasios didymos  meaning  green twins 


 * Uses:**  Misch metal used in making cigarette lighters, contains 5% praseodymium metal.

.It dose not occur in nature.
 * Interesting Facts**:  It is created by bombarding plutonium with alpha particles.

media type="youtube" key="IL06CzXF3ns" width="425" height="350" > >
 * Photo: http://www.flickr.com/photos/davidbaker/408601748/ 
 * Video: http://www.youtube.com/watch?v=IL06CzXF3ns&feature=channel
 * History: http://homepage.mac.com/dtrapp/Elements/combination.html#Pr