noun
- Plural of actinium; multiple atoms or samples of the radioactive chemical element with atomic number 89.
Usage: chemistry; technical
Examples
- The laboratory stored several actiniums in shielded containers for research purposes.
- Actiniums are rarely encountered outside of nuclear research facilities.
- The decay of actiniums produces thorium and other elements.
- Scientists study actiniums to understand radioactive decay chains.
- Actiniums have a half-life of about 21 years.