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the world > matter > chemistry > elements and compounds > metals > [noun] > groups > actinides (3)
actinide1945

Any of the series of fifteen elements of the periodic table from actinium (atomic number 89) to lawrencium (atomic number 103), inclusive. In…

actinon1947

Chemistry. Any of the chemical elements of the actinide series.

actinoid1958

= actinide, n.

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