The general electronic configuration of lanthanoids is:
(n-2)f^{1-14} (n-1)d^{0-1} ns^2
(n-2)f^{10-14} (n-1)d^{0-1} ns^2
(n-2)f^{0-14} (n-1)d^{10} ns^2
(n-2)d^{0-1} (n-1)f^{1-14} ns^2
The f-block elements (lanthanoids and actinoids) are characterized by the filling of the inner f-orbitals. The electrons enter the (n-2)f orbitals. The general outer electronic configuration for these elements is . For lanthanoids specifically, n = 6, corresponding to the configuration .
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