protactinium

/protactinium/
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protactinium

A scientist carefully handles a sample of protactinium in a secure laboratory.

Definition
  1. Noun:
    • A short-lived radioactive metallic element: Protactinium is a chemical element with the symbol Pa and atomic number 91. It is a dense, silvery-gray, highly radioactive metal that occurs in trace amounts in uranium ores.
Examples of Usage
  • Noun:
    • Protactinium is an element in the actinide series of the periodic table.
    • Scientists study the decay chain of protactinium to understand nuclear processes.
Advanced Usage
  • Scientific Context: The term is used almost exclusively in chemistry, physics, and nuclear science contexts.
    • The isotope protactinium-231 has a half-life of over 32,000 years.
Variants and Related Words
  • Protactinium-231 (n): The most common and longest-lived isotope of protactinium.
  • Protactinium-234m (n): A nuclear isomer of protactinium-234, an intermediate in the uranium decay series.
Synonyms
  • Element 91: A synonym referring to its atomic number.
  • Pa: The chemical symbol for protactinium.
Related Phrases and Terms
  • Actinide element: The series of elements to which protactinium belongs.
  • Uranium decay series: The radioactive decay chain in which protactinium is found as an intermediate product.
protactinium

A scientist carefully handles a sample of protactinium in a secure laboratory.

Noun
  1. a short-lived radioactive metallic element formed from uranium and disintegrating into actinium and then into lead

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