โ–ธโ–ธ
  • ๐Ÿ‡ฌ๐Ÿ‡ง Promethium
  • ๐Ÿ‡บ๐Ÿ‡ฆ ะŸั€ะพะผะตั‚ั–ะน
  • ๐Ÿ‡จ๐Ÿ‡ณ ้‰•
  • ๐Ÿ‡ณ๐Ÿ‡ฑ Promethium
  • ๐Ÿ‡ซ๐Ÿ‡ท Prométhium
  • ๐Ÿ‡ฉ๐Ÿ‡ช Promethium
  • ๐Ÿ‡ฎ๐Ÿ‡ฑ ืคืจื•ืžืชื™ื•ื
  • ๐Ÿ‡ฎ๐Ÿ‡น Prometio
  • ๐Ÿ‡ฏ๐Ÿ‡ต ใƒ—ใƒญใƒกใƒใ‚ฆใƒ 
  • ๐Ÿ‡ต๐Ÿ‡น Promécio
  • ๐Ÿ‡ช๐Ÿ‡ธ Prometio
  • ๐Ÿ‡ธ๐Ÿ‡ช Prometium
  • ๐Ÿ‡ท๐Ÿ‡บ ะŸั€ะพะผะตั‚ะธะน

Promethium - 61Pm: historical information

  • Discoveror: J. A. Marinsky, Lawrence Glendenin, Charles D. Coryell
  • Place of discovery: United States
  • Date of discovery: 1945
  • 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. A group at Ohio State University (USA) claimed element 61 in experiments involving its synthesis in a cyclotron, but again the evidence did not satisfy everyone. In 1947, Marinsky, Glendenin, and Coryell at Oak Ridge, Tennessee, USA, made the first chemical identification of promethium by use of ion-exchange chromatography on residues in a nuclear reactor.