`Ln^(3+)` (trivalent lanthanides ions ) have electronic configuration.
A. `[Xe]4f "to" [Xe]4f^(14)`
B. `[Xe]4d^(1)4f"to"[Xe]4d^(1)4f^(14)`
C. `[Xe]4d^(2)4f^(0)"to"[Xe]4d^(1)4f^(14)`
D. `[Xe]4f^(0)"to"[Xe]4f^(14)`

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Correct Answer - A
`[Xe]4f^(1)to[Xe]4f^(14)`

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