โ–ธโ–ธ
  • ๐Ÿ‡ฌ๐Ÿ‡ง Protactinium
  • ๐Ÿ‡จ๐Ÿ‡ณ ้ท
  • ๐Ÿ‡ณ๐Ÿ‡ฑ Protactinium
  • ๐Ÿ‡ซ๐Ÿ‡ท Protactinium
  • ๐Ÿ‡ฉ๐Ÿ‡ช Protactinium
  • ๐Ÿ‡ฎ๐Ÿ‡ฑ ืคืจื•ื˜ืงื˜ื™ื ื™ื•ื
  • ๐Ÿ‡ฎ๐Ÿ‡น Protoattinio
  • ๐Ÿ‡ฏ๐Ÿ‡ต ใƒ—ใƒญใƒˆใ‚ขใ‚ฏใƒใƒ‹ใ‚ฆใƒ 
  • ๐Ÿ‡ต๐Ÿ‡น Protactínio
  • ๐Ÿ‡ท๐Ÿ‡บ ะŸั€ะพั‚ะฐะบั‚ะธะฝะธะน
  • ๐Ÿ‡ช๐Ÿ‡ธ Protactinio
  • ๐Ÿ‡ธ๐Ÿ‡ช Protaktinium

Protactinium: historical information

  • Discoveror: Otto Hahn, Lise Meitner, Frederick Soddy, John Cranston
  • Place of discovery: Germany, England
  • Date of discovery: 1913
  • Origin of name : from the Greek word "protos" meaning "first".

Protactinium is found in pitchblende and ores form Zaire and is one of the rarest and most expensive naturally occurring elements. Protactinium was identified by Fajans and GΔhring in 1913 who named the new element brevium ("brief"). The metal itself was not isolated until 1934 when Aristid Grosse developed two methods. One involved reduction of the pentoxide Pa2O5 with a stream of electrons in a vacuum and the second involved heating the iodide PaI5 under vacuum.