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Topics related to "Protactinium"

protactinium
protactinium , radioactive chemical element; symbol Pa; at. no. 91; at. wt. 231.0359; m.p. greater than 1,600°C; b.p. 4,026°C; sp. gr. 15.37 (calculated); valence +4, +5. Protactinium is a malleable, shiny silver-gray radioactive metal. It does not tarnish rapidly in air. Known compounds inc... Read more
actinide series
actinide series a series of radioactive metallic elements in Group 3 of the periodic table . Members of the series are often called actinides, although actinium (at. no. 89) is not always considered a member of the series. The series always includes the 14 elements with atomic numbers 90 through... Read more
Lise Meitner
Lise Meitner , 1878-1968, Austrian-Swedish physicist and mathematician. She was professor at the Univ. of Berlin (1926-33). A refugee from Germany after 1938, she became associated with the Univ. of Stockholm and with the Nobel Institute at Stockholm. In 1917, working with Otto Hahn , she isolated ... Read more
thorium
thorium [from Thor ], radioactive chemical element; symbol Th; at. no. 90; at. wt. 232.0381; m.p. about 1,750°C; b.p. about 4,790°C; sp. gr. 11.7 at 20°C; valence +4. Thorium is a soft, ductile, lustrous, silver-white, radioactive metal. At ordinary temperatures it has a face-cent... Read more
uranium
uranium , radioactive metallic chemical element; symbol U; at. no. 92; at. wt. 238.0289; m.p. 1,132°C; b.p. 3,818°C; sp. gr. 19.1 at 25°C; valence +3, +4, +5, or +6. Properties Uranium is a hard, dense, malleable, ductile, silver-white, radioactive metal of the actinide series... Read more

Encyclopedia entries related to "Protactinium"

protactinium
Book article from: The Columbia Encyclopedia, Sixth Edition protactinium , radioactive chemical element; symbol...calculated); valence +4, +5. Protactinium is a malleable, shiny silver-gray...and a pentoxide (Pa 2 O 5 ). Protactinium has 24 isotopes of which only three...
Periodic Table of the Elements: Protactinium
Book article from: The Columbia Encyclopedia, Sixth Edition Periodic Table of the Elements: Protactinium Periodic Table of the Elements: Protactinium Atomic Number: 91 Atomic Symbol: Pa Protactinium Atomic Weight: 231.0359 Electron Configuration: 2 · 8&thinsp...
Actinides
Encyclopedia entry from: The Gale Encyclopedia of Science ...members are: actinium, thorium, protactinium, uranium, neptunium, plutonium...atomic symbol, Ac), thorium (Th), protactinium (Pa), and uranium (U) are extracted...Africa, and Namibia, thorium and protactinium are available in large quantities...
actinide series
Book article from: The Columbia Encyclopedia, Sixth Edition ...members are (in order of increasing atomic number) thorium , protactinium , uranium , neptunium , plutonium , americium , curium...plutonium have been found in uranium ores. Actinium and protactinium are found in nature as decay products of some thorium and...
thorium
Book article from: The Columbia Encyclopedia, Sixth Edition ...thorium-233, emitting a gamma ray. Thorium-233 decays (half-life about 22 min) to protactinium-233, emitting a beta particle. The protactinium-233 decays (half-life about 27 days) with another beta particle emission to uranium...
chemical elements
Book article from: World Encyclopedia ...Potassium K 19 39.098 1 63.2 777 1807 Praseodymium Pr 59 140.9077 3 931 3512 1885 Promethium Pm 61 (145) 3 1080 2460 1941 Protactinium Pa 91 231.0359 ―― 1200 4000 1913 Radium Ra 88 226.0254 2 700 1140 1898 Radon Rn 86 (222) 0...
protoactinium
Book article from: The Columbia Encyclopedia, Sixth Edition protoactinium see protactinium .
Meitner, Lise
Book article from: World Encyclopedia Meitner, Lise (1878–1968) Austrian physicist. She studied under Ludwig Boltzmann . In 1917, Meitner and Otto Hahn discovered the radioactive element protactinium . In 1938 she was forced to flee Nazi Germany, shortly before Hahn discovered nuclear fission .
Hahn, Otto
Book article from: World Encyclopedia ...William Ramsay and Ernest Rutherford . In 1906, he returned to Germany to work with Lise Meitner. In 1917, they discovered protactinium . Hahn and Meitner investigated Enrico Fermi's work on the neutron bombardment of uranium . He received the 1944 Nobel...
brevium
Book article from: The Columbia Encyclopedia, Sixth Edition brevium see protactinium .

Dictionary entries related to "Protactinium"

radioactive age dating
Book article from: A Dictionary of Astronomy ...which decays to thorium-230 with a half-life of 4.5 × 10 9 years; uranium‐235, which decays to protactinium-231 with a half-life of 7.0 7times; 10 8 years; potassium-40, which decays to argon-40 with a half-life of...
Meitner, Lise
Dictionary entry from: Complete Dictionary of Scientific Biography ...for the still unknown precursor of actinium; they reported their success at the end of the war, naming the new element protactinium. In 1918 Meitner was appointed head of the physics department of the Kaiser-Wilhelm Institut. She also maintained her...
Pa
Book article from: The Oxford Pocket Dictionary of Current English Pa • abbr. ∎  pascal; pascals. ∎  Pennsylvania. • symb. the chemical element protactinium.

Related newspaper, magazine, and trade journal articles from HighBeam Research

Debate smolders over cause of ice ages. (R. Lawrence Edwards used protactinium dating to support the orbital theory of ice age development)(Earth Science)(Brief Article)
Magazine article from: Science News; 5/24/1997; ; 700+ words ; ...cold reception from Isaac J. Winograd, a researcher at the U.S. Geological Survey in Reston, Va. Winograd lauds the protactinium, dating technique but objects that the new study reanalyzed coral samples already known to support the orbital hypothesis...
Fine-Tuning the Steps in the Intricate Climate Change Dance.
News Wire article from: Ascribe Higher Education News Service; 12/7/2005; 700+ words ; ...two naturally occurring isotopes, protactinium and thorium, she compared the temperature...the east coast of the United States. Protactinium and thorium are daughter isotopes of...ocean floor, while some percentage of protactinium will be exported out of the North Atlantic...
Rate of Ocean Circulation Directly Linked to Abrupt Climate Change in North Atlantic Region.
News Wire article from: Ascribe Higher Education News Service; 4/22/2004; 700+ words ; ...ocean circulation. The isotopes, protactinium and thorium, are produced at constant...floor below where it was produced. Protactinium is removed less readily and thus remains...years. As a result, about half of the protactinium produced in North Atlantic water today...
Radioactive ammo lays them to waste. (radioactive warfare)
Magazine article from: Multinational Monitor; 1/1/1996; ; 700+ words ; ...least 4.5 billion years. Even when U-238 does decay, it turns first into thorium-234 and then into protactinium-234. Protactinium-234 releases highly potent beta particles that may lead to cancerous growth in body cells. The U.S...
JOHN GOFMAN DEAD AT 88; CONSIDERED FATHER OF ANTINUCLEAR MOVEMENT
Magazine article from: Rachel's Democracy & Health News; 8/30/2007; ; 700+ words ; ...Berkeley cyclotron and proved that it would fission spontaneously. He was also the codiscoverer of protactinium-232, uranium-232, and protactinium-233 during his graduate student years. In 1942, physicist J. Robert Oppenheimer, who headed...
HOW THE ATOM WORKS
Newspaper article from: The Independent - London; 3/10/1996; 700+ words ; ...One of its neutrons turns into a proton and it becomes protactinium-234, with 91 protons and 143 neutrons. One of the orbiting...partner as the proton changes its form, and so breaks away. Protactinium-234 is itself extremely unstable and loses no time in changing...
Commentary: List of elements set to "I am a Very Model of a Modern Major General"
Transcript from: NPR All Things Considered; 8/24/2000; 400 words ; ...uranium, europium, zirconium, lutetium, vanadium, and lanthanum, and osmium, and astatine, and radium, and gold, and protactinium, and indium, and gallium, and iodine, and thorium, and thulium, and thallium. There's yttrium, ytterbium, actinium...
Commentary: List of elements set to "I am the Very Model of a Modern Major General"
Transcript from: NPR All Things Considered; 8/24/2000; 400 words ; ...uranium, europium, zirconium, lutetium, vanadium, and lanthanum, and osmium, and astatine, and radium, and gold, and protactinium, and indium, and gallium, and iodine, and thorium, and thulium, and thallium. There's yttrium, ytterbium, actinium...
Analysis: Periodic table of elements
Transcript from: NPR Talk of the Nation Science Friday; 7/19/2002; ; 700+ words ; ...ruthenium, uranium, europium, zirconium, lutetium, vanadium and lanthanum and osmium and astatine and radium and gold, protactinium and indium and gallium and iodine and thorium and thulium and thorium. There's yttrium, ytterbium, actinium, rubidium...
New nanoscience study findings recently were reported by researchers at University of Texas.
Newspaper article from: Nanotechnology Weekly; 9/28/2009; 700+ words ; ...investigation of the effects of spin polarization, orbital polarization and spin-orbit coupling in six actinide elements, namely protactinium (Pa), uranium (U), neptunium (Np), plutonium (both alpha-Pu and delta-Pu), americium (Am) and curium...