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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 - Element information, properties and uses | Periodic Table
    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 Mendeleev said there should be an element between thorium and uranium, but it evaded detection
  • 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 | 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
  • Protactinium - Symbol Pa, Atomic Number 91 | Periodic Table
    Protactinium (Pa) is element 91 on the periodic table - Actinide Explore its atomic mass, electron configuration, oxidation states, and chemical properties
  • Periodic Table of Elements: Los Alamos National Laboratory
    Protactinium 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
  • Todays NYT Connections Hints (and Answer) for Friday, May 29, 2026
    If you’re looking for the Connections answer for Friday, May 29, 2026, read on—I’ll share some clues, tips, and strategies, and finally the solutions to all four categories Along the way, I’ll explain the meanings of the trickier words and we’ll learn how everything fits together Beware, there are spoilers below for May 29, NYT Connections #1,083! Read on if you want some hints
  • Protactinium Facts - Symbol Pa or Atomic Number 91
    Protactinium is a dense, silvery-gray metallic element with the symbol Pa and atomic number 91 It is a radioactive actinide found in trace amounts in uranium ores
  • Protactinium (Pa) - Element 91 | Periodic Table of Elements
    Protactinium is a dense, silvery-gray radioactive actinide It produces actinium-227 through decay It is both toxic and highly radioactive, costing around $280,000 per gram Scientific research, particularly geochronology (ocean sediment dating)
  • Protactinium | Pa (Element) - PubChem
    Chemical element, Protactinium, information from authoritative sources Look up properties, history, uses, and more





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