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There are 14 elements in actinoid series. Which of the following elements does not belong to this series?

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There are 14 elements in actinoid series. Which of the following elements does not belong to this series?
A. U
B. Np
C. Tm
D. Fm
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Correct Answer - C
Tm (Z=69) do not belong to actinoid series. The actinoid series is with atomic numbers 90 to 103. Thulium (T m) has atomic number 69 belongs to lanthanoids (4f series).
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