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protactinium    
n. 镤

镤

protactinium
n 1: a short-lived radioactive metallic element formed from
uranium and disintegrating into actinium and then into lead
[synonym: {protactinium}, {protoactinium}, {Pa}, {atomic number
91}]

Protactinium \Protactinium\
The radioactive chemical element, of atomic number 91; Atomic
symbol Pa; at. wt. of longest-lived isotope, 231 (T1/2 =
32,500 yrs.) Also called brevium, Uranium X2 and UX2.
[PJC]


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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
  • 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 predicted by Russian chemist Dmitry Mendeleyev in his 1871
  • Protactinium - Element information, properties and uses | Periodic Table
    Protactinium is little used outside of research Protactinium has no known biological role It is toxic due to its radioactivity Small amounts of protactinium are found naturally in uranium ores It is also found in spent fuel rods from nuclear reactors, from which it is extracted
  • Protactinium Pa 91 | Periodic Table of Elements | Los Alamos National . . .
    Protactinium is a very rare, dense, silvery-gray metal It is malleable and radioactive It reacts with oxygen, water vapor, and acids It is a highly toxic and radioactive rare earth metal that requires special handling Protactinium is a solid
  • Protactinium: Element Properties and Uses - samaterials. com
    Protactinium is a rare and highly radioactive element in the series of actinides within the periodic table It possesses several distinctive chemical and physical properties, which make it very valuable for scientific research, especially nuclear physics and studies of radioactive decay
  • Protactinium Facts, Symbol, Discovery, Properties, Uses
    Protactinium is a highly radioactive metal belonging to the family of actinides and denoted by the chemical symbol Pa [1] It has 27 isotopes with mass numbers ranging from 212 to 238 out of which protactinium-231 is the most stable one with a half-life of 3 276 x 10 4 years
  • PROTACTINIUM Definition Meaning - Merriam-Webster
    The meaning of PROTACTINIUM is a shiny radioactive metallic element of relatively short life
  • Isotopes of protactinium - Wikipedia
    Protactinium (91 Pa) has no stable isotopes As 231 Pa occurs in usable quantity, and comprises virtually all of the element, it defines the standard atomic weight Thirty radioisotopes of protactinium have been characterized, ranging from 210 Pa to 239 Pa
  • Protactinium Element Facts
    Protactinium is a very rare shiny, silvery, highly radioactive metal that tarnishes slowly in air to the oxide Almost all naturally occurring protactinium is the 231 isotope
  • Protactinium (Pa): Atomic Number 91, Protons Uses
    Protactinium (Pa) is element 91: 91 protons and 91 electrons, a solid at room temperature Electron configuration, isotopes, uses and quick facts





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