Protactinium - Wikipedia
WEBProtactinium is a chemical element; it has symbol Pa and atomic number 91. It is a dense, radioactive, silvery-gray actinide metal which readily reacts with oxygen, water vapor, and inorganic acids. It forms various chemical compounds, in which protactinium is usually present in the oxidation state +5, but it can also assume +4 and even +3 or ...
Protactinium - Element information, properties and uses
WEBElement Protactinium (Pa), Group 20, Atomic Number 91, f-block, Mass 231.036. Sources, facts, uses, scarcity (SRI), podcasts, alchemical symbols, videos and images.
Protactinium | Radioactive, Decay, Isotopes | Britannica
WEBProtactinium (Pa), radioactive chemical element of the actinoid series of the periodic table, rarer than radium; its atomic number is 91. It occurs in all uranium ores to the extent of 0.34 part per million of uranium. Its existence was predicted by Russian chemist Dmitry Mendeleyev in his 1871.
Periodic Table of Elements: Los Alamos National Laboratory
WEBProtactinium is one of the rarest and most expensive naturally occurring elements. The average concentrations of protactinium in the Earth's crust is typically on the order of a few parts per trillion, but may reach up to a few parts per million in some uraninite ore deposits.
Facts About Protactinium | Live Science
WEBSep 17, 2013 · Almost all naturally occurring protactinium is 231 Pa. It has a half-life of 32,700 years and is an alpha emitter formed by the decay of 235 U. Other uranium decays produce isotopes of...
Protactinium | History, Uses, Facts, Physical & Chemical …
WEBDefinition, mass & chemical names. Protactinium. Predicted by Dimitri Mandeleev in 1871, protactinium was first identified in 1913 by Kasimir Fajans and Oswald Helmuth Gohring. It is highly radioactive, scarce and toxic element and has no uses outside scientific research. History and Discovery.
Protactinium: Element 91 - Uses, Properties, and Facts
WEB- Protactinium is a radioactive element that sits in the actinide series of the periodic table. It is symbolized as "Pa" and has the atomic number 91. Protactinium is silver-gray, lustrous, and malleable. - Its primary significance lies in its fleeting presence in the decay chain of uranium and thorium.
Protactinium - Wikiwand
WEBProtactinium is a chemical element; it has symbol Pa and atomic number 91. It is a dense, radioactive, silvery-gray actinide metal which readily reacts with oxygen, water vapor, and inorganic acids. It forms various chemical compounds, in which protactinium is usually present in the oxidation state +5, but it can also assume +4 and even +3 or ...
Protactinium | SpringerLink
WEBJan 1, 2018 · The element protactinium (Pa) is a short-lived nuclide belonging to the decay chain of 235-Uranium and the third element in the actinide series (Z = 91) with an atomic mass of 231.0359.
Protactinium, Physical and Chemical Properties | SpringerLink
WEBProtactinium is a radioactive metal formed in the decay chain of uranium but not thorium (Fig. 1 ). It exists in two crystalline forms: α-Protactinium is tetragonal body-centered ( a = 393.1 pm, c = 323.6 pm) and β protactinium is cubic face-centered ( a = 501.9 pm).
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