actinide

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Related to Actinide element: Actinoid series elements

Actinide

Any of the 15 metallic elements with an atomic number between 89 and 103, which fill the 5f electron shell.
Actinides 89Ac, 90Th, 91Pa, 92U, 93Np, 94Pu, 95Am, 96Cm, 97Bk, 98Cf, 99Es, 100Fm, 101Md, 102No, 103Lr

actinide

(ak′tĭ-nīd″) [ actin- + -ide]
Any of the radioactive heavy metals designated on the periodic table of elements with atomic numbers 89–103. The actinides include naturally occurring elements, e.g., actinium and uranium, and artificial elements, e.g., fermium.
References in periodicals archive ?
Several years later theorists predicted that lighter elements, such as dysprosium and other rare earths, could also assume a relatively stable, superdeformed shape if they were rapidly rotated; the rotational energy would play the same role as Coloumb interactions in the actinide elements. The theory suggested that the most stable superdeformed shapes would have 2:1 or other integer ratios.
The focus of Veliscek-Carolans research is to treat solutions of spent nuclear fuel and recycle actinide elements, such as uranium, that can be re-used as fuel.