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Protactinium - Wikipedia
Protactinium 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 … See more
In 1871, Dmitri Mendeleev predicted the existence of an element between thorium and uranium. The actinide series was unknown at the time, so Mendeleev positioned See more
Protactinium is one of the rarest and most expensive naturally occurring elements. It is found in the form of two isotopes – Pa and Pa, with the isotope Pa occurring in two different energy … See more
Protactinium is an actinide positioned in the periodic table to the left of uranium and to the right of thorium, and many of its physical properties are intermediate between its … See more
Although protactinium is situated in the periodic table between uranium and thorium, both of which have numerous applications, there … See more
Twenty-nine radioisotopes of protactinium have been discovered. The most stable are Pa with a half-life of 32,760 years, Pa with a half-life of 27 days, and Pa with a half-life of 17.4 days. All other isotopes have half-lives shorter than 1.6 days, and the majority of … See more
Before the advent of nuclear reactors, protactinium was separated for scientific experiments from uranium ores. Since reactors have become more common, it is mostly produced as an intermediate product of nuclear fission in thorium high-temperature … See more
Here, a, b, and c are lattice constants in picometers, No is the space group number, and Z is the number of formula units See more
Wikipedia text under CC-BY-SA license Protactinium - Element information, properties and uses | Periodic …
Periodic Table of Elements: Los Alamos National …
Protactinium is a rare and radioactive element with atomic number 91 and symbol Pa. It is a decay product of uranium and thorium, and has various oxidation states and compounds. Learn more about its discovery, sources, …
Pa Element or Protactinium Facts - ThoughtCo
Aug 2, 2019 · 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 …
Protactinium | Radioactive, Decay, Isotopes | Britannica
Protactinium (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 …
Protactinium | History, Uses, Facts, Physical & Chemical …
The atomic number of protactinium is 91 and is represented by symbol Pa. Chemical Characteristics. Protactinium has bright metallic lustre and tarnishes slowly in air. Protactinium reacts with air, oxygen, acids and water vapours. It …
Protactinium (Pa) - The Chemical Elements
Chemical data for Pa - Protactinium - PhysLink.com
Protactinium | Pa (Element) - PubChem
Protactinium is a chemical element with symbol Pa and atomic number 91. Classified as a n actinide, Protactinium is a solid at room temperature.