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In the lanthanoid series the differentiating (last) electron enters the

  1. A4f subshell
  2. B5d subshell
  3. C6s subshell
  4. D5f subshell

Answer: A

Lanthanoids (Ce to Lu) are the first f-series and fill the 4f subshell. The 5f subshell is filled in the actinoids.
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