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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 _________ __________ _____ ___ _____ ______ ___ ____.
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