prométhéum

Traductions

• anglais

  Date : 1983

  Définition

  An element. State: solid; group: IIIB (lanthanide series); atomic no.: 61; atomic wt.: 147(?); valence: 3. A radioactive rare-earth metal; its longest-lived isotope (145) has a half-life of 18 years. The element has been isolated only in trace quantities. The 147 isotope with half-life of 2.6 years is the only one that has practical use, as in luminescent coatings for instrument dials and as a power source for semiconductor solar batteries for space use.

  Note :

  Promethium forms only a few compounds, which are of chiefly theoretical interest.

  Termes :

  1. promethium
  2. Pm

  [Pm] Symbol for the chemical element promethium, the name being derived from the mythological hero Prometheus, reputed to have stolen fire from the gods and brought it to earth.