praséodyme

Traductions

• anglais

  Date : 1983

  Définition

  An element. State: solid; group: IIIB (lanthanide series); atomic no.: 59; atomic wt.: 140.9077; valence: 3,4. A member of the rare-earth group of elements, praseodymium is a rather soft crystalline solid; m.p. 935 °C (1715 °F), obtained from monazite sands. The metallic form is similar to iron in color, and many of its compounds have a pronounced greenish shade.

  Note :

  It has limited use in ceramics and glass manufacture and a catalyst and phosphor. It has a number of specialized applications in metallurgy.

  Termes :

  1. praseodymium
  2. Pr

  [Pr] Symbol for the element praseodymium, from the greek prasinos (« green ») and didymos (« twin »), denoting the green color of salts of the element.