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

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

Jharkhand CECEJharkhand CECE 2013

Solution:

Actinoid series is with atomic number 90 to 103. Thulium(Tm) has atomic number 69.