Question

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

Answer 1

Answer: (C)

Tm

Answer 2

Actinoid series has elements from atomic no. 90 to 103. Thulium (Tm) has atomic no. 69