actinium
/æk'tiniəm/
Definition
- Noun:
- A radioactive chemical element: Actinium is a radioactive metallic element belonging to the actinide series in the periodic table. It is found naturally in trace amounts in uranium ores.
Usage
- Actinium is primarily used in scientific research and as a source of neutrons. It is not used in commercial applications due to its scarcity and high radioactivity.
- The word "actinium" is used as a mass noun when referring to the element as a substance.
Examples
- Noun:
- Actinium-227 is a radioactive isotope with a half-life of 21.8 years.
- Scientists study the decay chain of actinium to understand nuclear processes.
- Uranium ores contain minute quantities of actinium.
Advanced Usage
- "Actinium series": Refers to one of the three classical radioactive decay series, of which actinium-235 is the parent nuclide.
- The actinium series ends with the stable isotope lead-207.
- In compound terms: While "actinium" itself is the target word, it forms the root for related terms in chemistry.
- Actinide: The series of elements to which actinium belongs.
- Actinium compound: A chemical compound containing actinium atoms.
Variants and Related Words
- Actinide (n): Any of the series of 15 metallic chemical elements with atomic numbers from 89 (actinium) to 103 (lawrencium).
- Actinoid (adj/n): Another term for actinide; having properties similar to actinium.
Synonyms
- Element 89: Referring to its atomic number.
- Ac: Its chemical symbol.
Notes on Different Meanings
- "Actinium" has only one primary meaning as the name of the chemical element (symbol Ac, atomic number 89). It does not have idiomatic or phrasal verb uses.
Noun
-
a radioactive element of the actinide series; found in uranium ores
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