astatine
Definition
Noun: 1. A highly unstable radioactive chemical element: Astatine is a synthetic element that is radioactive and decays rapidly. It is the heaviest known member of the halogen group in the periodic table. 2. A decay product: It occurs naturally in minute quantities as an intermediate decay product of uranium and thorium.
Usage Examples
- Noun:
- Astatine is so rare that scientists typically study it by creating it in particle accelerators.
- The most stable isotope of astatine has a half-life of only about 8 hours.
Advanced Usage
- Chemical Symbol: The chemical symbol for astatine is At.
- The compound was tagged with At-211 for the experimental treatment.
- In Research: Due to its radioactivity and rarity, astatine is primarily of scientific research interest, particularly in nuclear medicine.
- Researchers are investigating astatine-211 for use in targeted alpha-particle therapy for cancer.
Variants and Related Words
- Halogen (noun): Any of the five chemically related elements in Group 17 of the periodic table (fluorine, chlorine, bromine, iodine, astatine). Astatine is a halogen.
- Radioisotope (noun): A radioactive isotope. Astatine-211 is a medically significant radioisotope.
Synonyms
- Element 85: A synonym referring to its atomic number.
- (There are no common true synonyms for specific element names like .)
Notes on Meaning
This word has a single, specific scientific meaning as the name of a chemical element. It is not used in idiomatic expressions or phrasal verbs.
Noun
-
a highly unstable radioactive element (the heaviest of the halogen series); a decay product of uranium and thorium
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