What is the general outermost shell electronic configuration for Lanthanoids?

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Solution

Lanthanoids:
The lanthanoid series consists of metallic elements from atomic number $57 to 71$ .
They are considered f-block transition metals.
These elements are placed separately in the periodic table due to their different electronic structures.
General electronic configuration for Lanthanoids:
The general outermost shell electronic configuration for Lanthanoids is $(n - 2) f^{1 - 14} (n - 1) d^{0 - 1} {ns}^{2}$ .

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