The first protactinium isotope (more precisely, nuclear isomer), the short-lived 234m Pa (half-life T ½ = 1.18 min), was discovered in 1913 by K. Fajans and the German physicist O. Göhring in the radioactive uranium-radium series. Answer to: Who discovered protactinium? 1 answer. Nearly all naturally occurring protactinium is 231 Pa with a half-life of 32,700 years. Women of the Periodic Table Quilt. 1.175 minutes, and 1.25 grams (half of 2.5 grams) after another 1.175 minutes, and so on. 1 answer. Nearly all naturally occurring protactinium is 231 Pa with a half-life of 32,700 years. DISCOVERED BY: Protactinium was discovered by a man named Kasimir Fagans in 1913. Four years later a more stable isotope of protactinium was discovered by Otto Hahn and Lise Meitner. answered Dec 21, 2012 by ... asked Dec 21, 2012 by anonymous. Protactinium: history Protactinium was discovered by Otto Hahn, Lise Meitner, Frederick Soddy, John Cranston in 1913 at Germany, England. Enter the answer length or the answer pattern to get better results. The metal occurs about three parts per trillion and sometimes in parts per million in uranium ores. It was discovered by Otto Hahn in 1921. Discovered by. The Atomic Elements and Their Uses (Element) (Symbol) (Atomic number) (Atomic weight) Protactinium Pa 91 231.0359 Isolated by Otto Hahn and Lise Meitner of Germany in 1917. It is malleable, shiny, silver-gray, radioactive. They found protactinium-234, which, because of its short half-life (1.17 minutes), they called "brevium. Protactinium is known to be one of the most expensive and rarest naturally occurring elements on the earth. 1 answer. Who discovered Rhenium? 0 votes. Gohring in the year 1913. Who discovered Europium? However, the metal is dangerous to handle because it and its compounds are both toxic and radioactive. It was discovered in 1913 by Kazimierz Fajans and Oswald Helmuth Göhring, who named it brevium for its short half-life. 1 answer. Neptunium: Discovered in 1940 by Edwin McMillan and Phillip Abelson 94. Until the discovery by Fajans and Göhring, the element had been known as uranium-X 2 . Overview. Uranium: Discovered in 1789 by Martin Heinrich Klaproth 93. Protactinium is one of the rarest elements on Earth.It is formed when uranium and other radioactive elements break down. asked Dec 21, 2012 by anonymous. Date taken: 2019-03-06 19:00 1 Answer. The international union for pure and applied chemistry finalized the name protactinium for this new element, in 1949. If completely fissioned, one pound (0.45 kilograms) of uranium-233 will provide the same amount of energy as burning 1,500 tons (1,350,000 kilograms) of coal. What does the name Protactinium come from? Gohring in 1913. K. Kajans and O.H. Protactinium-234m is a member of the uranium series with a half-life of 1.17 minutes. (Pa), a radioactive chemical element; one of the actinides. Twenty-nine radioisotopes of protactinium have been discovered. It is an alpha emitter and is formed by the decay of uranium-235, whereas the beta radiating protactinium-234 with a half-life of 6.74 hours is produced as a result of uranium-238 decay. It was only in 1934 when the element was first isolated. Who discovered Protactinium? 91. Protactinium-234 is a member of the uranium series with a half-life of 6.70 hours. The uranium processing obtains it as a by-product. Protactinium-234m. asked Dec 21, 2012 by anonymous. The Crossword Solver finds answers to American-style crosswords, British-style crosswords, general knowledge crosswords and cryptic crossword puzzles. Twenty-nine radioisotopes of protactinium have been discovered. What period is Protactinium located? Protactinium. She discovered an isotope of protactinium. 1855: Edwin H. Hall was an American physicist who discovered the Hall effect. The bright area is the light emanating from its radioactivity, which was used to photograph this rare image. Protactinium was discovered in the year 1913, by Kasimir Fajans and Oswald Helmuth Göhring. A more stable isotope (231Pa) of protactinium was discovered in 1917/18 by Otto Hahn and Lise Meitner, and they chose the name proto-actinium, but then the IUPAC named it finally protactinium in 1949 and confirmed Hahn and Meitner as discoverers. Let’s find out the answers to these questions, along with many more facts about this metallic element from the following article.A dense, silver-gray metallic element, protactinium ranks high among some of the costliest elements that occur naturally. SYMBOL: Pa PHYSICAL PROPERTIES: Some physical properties of protactinium are the silver color, it is super conductive, radioactive, and its density is 1 5370 kg. asked Dec 21, 2012 by anonymous. The first isotope of protactinium (234mPa) was discovered by Kasimir Fajans and Otto Gohring in 1913. Protactinium: Photograph of protactinium-233 (darker circular area) taken at the National Reactor Testing Station in Idaho circa 1969. Göhring discovered Pa-231 in 1913, while Lise Meitner and Otto Hahn (Germany), K. Fajans (Germany) and F. Soddy, J.A. Americium: Discovered in 1944 by Glenn Seaborg and colleagues 96. Before its identification, the possibility of existence of a chemical element between thorium and uranium was predicted by Dmitri Mendeleev, in the year 1871. 1 answer. Plutonium: Discovered in 1940 by Glenn Seaborg and colleagues 95. Meitner and Hahn discovered that most of the atoms of "brevium" had long life-times, so they renamed it protactinium, from the Greek protos for 'first' and actinium, since it … By signing up, you'll get thousands of step-by-step solutions to your homework questions. Protactinium is in the Period 7. It is superconductive at temperatures below 1.4 K. Cranston and A. Fleck (Scotland) discovered Pa-231 in 1917. Different sources credit the discovery of Protactinium because Kasimir Fajans and O.H. Protactinium metal has 29 isotopes. Who discovered Europium? Protactinium is located in the F Block block. Isotopes of Protactinium-231 used in nuclear weapon. 1 answer. ATOMIC MASS/NUMBER: The atomic mass is 231.036 and the atomic number is 91. Protactinium was first discovered in 1913, when Kasimir Fajans and O. H. Göhring encountered short-lived isotope 234m-Pa, with a half-life of about 1.17 minutes, while they were studying the decay chain of 238-U. Who discovered Rhenium? It is an alpha emitter and is formed by the decay of uranium-235, whereas the beta radiating protactinium-234 with a half-life of 6.74 hours is produced as a result of uranium-238 decay. asked Dec 21, 2012 by anonymous. The first isotope of protactinium (234mPa) was discovered by Kasimir Fajans and Otto Gohring in 1913 (Germany). They chose a name Proto-actinium for this element indicating actinium (Ac-89) is a decay product of this new element. Origin of name: from … asked Dec 21, 2012 by anonymous. Discoverer of protactinium. Who discovered Protactinium? 1878: Lise Meitner was the Austrian-Swedish physicist who discovered protactinium. A.-L. Debierne. The heaviest known element was named after Lise for her research in the 1930s and 40s, and she’s received an Enrico Fermi Award for her work, a top honor from the U.S. Department of Energy. What block is Protactinium located? The element Protactinium was discovered by William Crookes in year 1913 in Germany and United Kingdom . who was the scientist who discovered the atom; Protactinium? In protactinium. The long-lived isotope protactinium-231 (originally called protoactinium for “before actinium” and later shortened to protactinium) was discovered (1917) independently by German chemist Otto Hahn and Austrian physicist Lise Meitner in pitchblende, by Fajans, and by British chemists Frederick Soddy, John Cranston, and Sir Alexander Fleck. Protactinium derived its name from the Greek protos, 'first', and actinium, which is produced through the radioactive decay of protactinium Protactinium Presence: Abundance in … Protactinium-231 was discovered by John Cranston and Frederick Soddy and Lisa Meitner and Otto Hahn in 1918. Who discovered Actinium? 1 answer. Protactinium-233 has a half-life of about 27 days and decays into uranium-233, also through beta decay. Protactinium was first identified by Kasimir Fajans and O. H. Gohring in 1913 while they were studying uranium's decay. 1867: Marie Curie was the French scientist who discovered radium and won the Nobel Prize in 1903 and 1911. Facts about Protactinium: Protactinium: Dense, silvery-grey, radioactive metal Named from the Greek word meaning “the first”, protactinium is a silvery, radioactive metal. Protactinium is a radioactive metal with the chemical symbol Pa. asked Dec 21, 2012 by anonymous. Who discovered Actinium? Protactinium was the last puzzle piece needed to complete Mendeleev’s periodic table in 1871, and because it served importance in the industry of chemistry, those who discovered, identified and classified the element received praise around the world. The Crossword Solver found 21 answers to the otto ; chemist who discovered nuclear fission and protactinium with lise meitner (4) crossword clue. Protactinium is a silver metallic element that belongs to the actinide group. The element was discovered by two persons named K.Kajans and O.H. Protactinium: Discovered in 1913 by Kasimir Fajans and Otto Göhring 92. asked Dec 21, 2012 by anonymous. Who discovered Krypton? PROTACTINIUM (REVISED) Note: This article, originally published in 1998, was updated in 2006 for the eBook edition. About the chemical element Protactinium, its symbol, atomic number and weight, who discovered it and when. Lise Meitner discovered another isotope of the element with a much longer half-life and proposed the name protactinium. The Cambridge Science Festival (CSF) is an annual spectacle of more than 150 science-related events and activities taking … Protactinium was discovered by Fredrich Soddy, John Cranston, Otto Hahn, Lise Meitner. Protactinium is a radioactive element predicted to exist in 1871 by Mendeleev, although it was not discovered until 1917 or isolated until 1934.The element has atomic number 91 and element symbol Pa. Like most elements on the periodic table, protactinium is a silver-colored metal. It does not tarnish rapidly in air, it is attacked by oxygen, steam and acids, but not by alkalis. 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