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