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The general electronic configuration of lanthanoids is characterized by the gradual filling of the 4f orbitals. Typically, lanthanoids have the outer electronic configuration [Xe] 6s² 4f¹⁻¹⁴, where the 4f subshell progressively fills across the series from lanthanum (La) to lutetium (Lu). In most cases, the 5d orbital remains unoccupied in the ground state, and the 4f electrons are added one by ____ _____ ______ __________ ___ _________ _______ _______ _____ _______ ___ ________.
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