Definitions
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun Plural form of
actinoid .
Etymologies
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Examples
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There are fifteen actinoid (rare earth) elements from which fissile isotopes can be produced; uranium and thorium are the only naturally occurring actinoids.
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Instead of leaving the lanthanoids and actinoids in separate groups, why don't they merge them into the appropriate circles?
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