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definition of the word actinium

by the Wiktionnary

Chemical element
Ac Previous: radon (Ra)
Next: thorium (Th)

Singular
actinium

Plural
uncountable

actinium (uncountable)

Wikipedia has an article on:
Actinium

Wikipedia

  1. a radioactive, metallic chemical element (symbol: Ac) with an atomic number of 89; found in uranium ores


Definition from Wiktionary
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