Protactinium blev første gang identificeret i 1913, da Kasimir Fajans og O. H. Göhring under studiet af henfaldsprodukterne fra 238 U stødte på en kortlivet isotop, 234m Pa, med en halveringstid på 1,17 minut: De kaldte stoffet for brevium, af latin; brevis, "kort". This table gives information about some radiosotopes of protactinium, their masses, their half-lives, their modes of decay, their nuclear spins, and their nuclear magnetic moments. Det navn blev dog ændret til protoactinium i 1918, da to forskerhold (Otto Hahn og Lise Meitner i Tyskland, og Frederick Soddy og John Cranston i Storbritannien) uafhængigt af hinanden opdagede isotopen 231Pa, og yderligere "forkortet" til det nuværende navn, protactinium, i 1949. Home Mining & Minerals Information Periodic Table of the Elements. 22:11. Biological Benefits Protactinium blev første gang identificeret i 1913, da Kasimir Fajans og O. H. Göhring under studiet af henfaldsprodukterne fra 238U stødte på en kortlivet isotop, 234mPa, med en halveringstid på 1,17 minut: De kaldte stoffet for brevium, af latin; brevis, "kort". The design and re-launch of the new MEC website is madepossible by a generous contribution from Newmont Mining, The SciFest All Access virtual science festival will offer engaging STEM activities and performances, The design and re-launch of the new MEC website is made. Denne side blev senest ændret den 26. oktober 2018 kl. Protactinium has few uses, but becomes superconducting at very low temperatures. Register here. This metal has around five isotopes with their mass numbers ranging between 212 to 238 and protactinium 231 is considered to be the most stable isotope with a half-life of about 32,760 years. exist. Outside of science, no applications for protactinium metal In 1961, the Great Britain Atomic Energy Authority was able to produce 125 grams of 99.9% pure protactinium, although they had to process about 55,000 kilograms of ore and spend about $500,000 to get it. Protactinium has a bright metallic lustre which it retains for some time in air. Den mest "sejlivede" protactiniumisotop er 231Pa, med en halveringstid på 32760 år, mens de øvrige har halveringstider fra knap en måned og nedefter. I 1927 fremstillede Aristid V. Grosse 2 milligram Pa2O5. The half-life of the most stable isotope 231Pa is 32760 years. The SciFest All Access virtual science festival will offer engaging STEM activities and performances SEPTEMBER 16-23, 2020, that celebrate the excitement of STEM for K-12 students, college students, educators, and families. Man kender 29 isotoper af protactinium, som alle er radioaktive. The element occurs inpitchblende to the extent of about 1 part 231Pa to 10 million of ore. Ores from Zaire haveabout 3 ppm. Therefore Protactinium metal only exists in small amounts, most of it is found in nuclear waste. No known benefits for life processes in plants and animals.

Protactinium metal is a shiny, radioactive and silvery metal that degrades slowly in the presence of air to form oxides. Protactinium er det 91. grundstof i det periodiske system, og har det kemiske symbol Pa: Under normale temperatur- og trykforhold optræder dette actinid som et sølvskinnende, radioaktivt metal. Protactinium metal primarily is generated from the decay of the rare isotope uranium 235 (via the very unstable thorium 231).

Pa 91 Protactinium Protactinium metal primarily is generated from the decay of the rare isotope uranium 235 (via the very unstable thorium 231). Named from the Greek word meaning “the first”, protactinium is a silvery, radioactive metal.

There is an additional prize ($500) for the video that receives the most votes online—the People’s Choice winner. Mineralet begblende indeholder normalt omkring 0,1 ppm 231Pa, men forekomster i Zaire indeholder op imod 3 ppm. It is believed to stimulate the metabolism. Det er superledende ved temperaturer under 1,4 kelvin. Protactinium has abright metallic luster which it retains for some time in air. Protactinium-231 was discovered by John Cranston and Frederick Soddy and Lisa Meitner and Otto Hahn in 1918.

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