Pr+59


 * Praseodymium element 59 **

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 * Atomic Number:** 59
 * Atomic Weight:** 140.90765
 * Melting Point:** 1204 K (931°C or 1708°F)
 * Boiling :** 3793 K (3520°C or 6368°F)
 * Density:** 6.77 grams per cubic centimeter
 * Phase at Room Temperature:** Solid
 * Element Classification:** Metal
 * Period Number:** 6
 * Group Number:** none
 * Group Name:** Lanthanid

Electrons and Neutrons

Praseodymium **
 * [[image:pr-1-2.gif]]
 * Number of Protons and Electrons: ** 59
 * Number of Neutrons: ** 82

** Isotopes **
 * ** Isotope ** || ** Half Life ** ||
 * Pr-141 || Stable  ||
 * Pr-142 || 19.12 hours  ||
 * Pr-143 || 13.57 days  ||
 * Pr-144 || 17.28 minutes  ||
 * Pr-145 || 7.2 minutes ||

Electron configuration: 4f3 6s2

Physical and chemical properties

Praseodymium is a metal that reacts with oxygen and water. Is a yellowish kind brown silver color, is fund in Brazil, USA, India, Australia and many other places. Praseodymium is a toxic material, which can damage the skin, eyes and longs. It is more resistant to corrosion in air the other rare metals, but it still needs to be stored under oil or coated with plastic.

History

Praseodymium was discovered by Carl F. Auer von Welsbach, a German chemist, in 1885. He was looking for a rare and strong material, that can be use. But by its chemical properties mainly was use to dye ceramics and glass. Its name is Greek.

Present industrial and commercial

Now day’s praseodymium is still use as an agent, to dye and give life to ceramics and glass, as well is use as an agent mix with other metals for the construction of aircrafts, and other engineering products.

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