actinoids

actinoids
n. any of a series of radioactive chemical elements with atomic numbers 89 through 103 adj. having a radial form; star-shaped; radiated

English contemporary dictionary. 2014.

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  • transition element — Chem. any element in any of the series of elements with atomic numbers 21 29, 39 47, 57 79, and 89 107, that in a given inner orbital has less than a full quota of electrons. Also called transition metal. [1920 25] * * * Any chemical element with …   Universalium

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