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There are 14 elements in actinoid series...

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

Text Solution

Verified by Experts

The correct Answer is:
C
Actinoids have atomic numbers from 90 - 103. Thus, thulium with atomic number 69 is not a member of actinoid series.
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CHHAYA PUBLICATION-D - AND F - BLOCK ELEMENTS -SOLVED NCERT EXEMPLAR PROBLEMS (Multiple Choice Question)
  1. Which of the following reactions are disproportionation reactions - ...

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  2. When KMnO(4) solution is added to oxalic acid solution, the decolouris...

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  3. There are 14 elements in actinoid series. Which of the following eleme...

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  4. KMnO(4) acts as an oxidising agent in acidic medium. The number of mol...

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  5. Which of the following is amphoteric oxide ? Mn(2)O(7), CrO(3), Cr(2)O...

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  6. Gadolinium belongs to 4f - series. It's atomic number is 64. Which of ...

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  7. Interstitial compounds are formed when small atoms are trapped inside ...

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  8. The magnetic moment is associated with its spin angular momentum and o...

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  9. KMnO(4) acts as an oxidising agent in alkaline medium. When alkaline K...

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  10. Which of the following statements is not correct -

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  11. When acidified K(2)Cr(2)O(7) solution is added to solution of Sn^(2+) ...

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  12. Highest oxidation state of manganese in fluoride is + 4 (MnF(4)) but h...

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  13. Although zirconium belongs to 4d transition series and hafnium to 5d t...

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  14. Why is HCl not used to make the medium acidic in oxidation reactions o...

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  15. Generally transition elements and their salts are coloured due to the ...

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  16. Transition elements show magnetic moment due to spin and orbital motio...

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  17. In the form of dichromate, Cr(VI) is a strong oxidising agent in acidi...

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  18. Which of the following actinoids show oxidation states upto + 7 -

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  19. General electronic configuration of actinoids is (n-2)f^(1-14)(n-1)d^(...

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  20. Which of the following lanthanoids show + 2 oxidation state besides th...

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