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Question

There are 14 elements in the actinoid series. Which of the following elements does not belong to this series?
  1. Fm
  2. U
  3. Np
  4. Tm


Solution

The correct option is D Tm
Actinoid series consists of elements from 90 to 103, Tm (Thulium) has an atomic number 69 and is part of the lanthanide series.

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