61

Pm

Promethium
[ 145 ]
 Historical Information

Promethium was discovered by J. A. Marinsky, Lawrence Glendenin, Charles D. Coryell at 1945 in United States. Origin of name: named after "Prometheus" in Greek mythology, who stole fire from the gods. Earlt claims to the discovery of promethium date back to 1924 but these appear have been substantiated.

Basic Information Shells
  • Name:Promethium
  • Symbol: Pm
  • Atomic number: 61
  • Atomic weight: [ 145 ]
  • Standard state: solid at 298 K
  • Group in periodic table:
  • Group name:Lanthanoid
  • Period in periodic table: 6
  • Block in periodic table: f-block
  • Classification: Metallic
 Promethium
Uses Trivia
  • shows promise as a portable X-ray unit
  • thickness gauges
  • used to convert light into electrical current

Little is yet generally known about the properties of metallic promethium. More than 30 promethium compounds have been prepared. Promethium is a rare earth metal. It appears that there is no known Pm existing in the earth's crust.