Actinoids.

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The series of fourteen elements from `._(90)Th` to `._(103)Lr` which follow actinium `(._(89)Ac)` and in which differentiating electrons are progressively filled in 5 f-orbitals in prepenultimate shell are called actinoids.
Their general electronic configuration is, `[Rn]^(86)overset(1-14)(5f)overset(0-1)(6d)" "7s^(2)`.
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