atomic number 89
Definition
Noun: 1. Actinium: A radioactive metallic chemical element of the actinide series, with the symbol Ac and atomic number 89. It is found in trace amounts in uranium ores as a product of radioactive decay.
Usage
- Scientific Context: The term "atomic number 89" is used almost exclusively in scientific, technical, and educational contexts to identify the element actinium by its fundamental property—the number of protons in its nucleus.
- Identification: It serves as a unique identifier for the element, distinguishing it from all other elements on the periodic table.
Examples
- The element with atomic number 89 is actinium.
- Atomic number 89 indicates that each atom of this element contains 89 protons.
- In the periodic table, actinium is positioned at atomic number 89.
Advanced Usage
- The term is used in formulas and systematic naming in chemistry and physics to denote the element unambiguously, especially in nuclear equations or when discussing isotopic series.
Variants and Related Words
- Actinium (Ac): The common name for the element identified by atomic number 89.
- Element 89: A synonymous way to refer to actinium.
Synonyms
- Actinium
- Ac (chemical symbol)
- Element 89
Different Meanings
The phrase "atomic number 89" has only one specific meaning: it is the definitive numerical identifier for the chemical element actinium. It does not have idiomatic or figurative uses.
Noun
-
a radioactive element of the actinide series; found in uranium ores
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