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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

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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NCERT EXEMPLAR-D AND F-BLOCK ELEMENTS-D And F-Block Elements
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  2. When KMnO(4) solution is added to oxalic acid solution , the decolouri...

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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 belongsd to 4f series. It's atomic number is 64. which of t...

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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 on 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 Sn^(2+) salts then S...

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  12. Higher oxidation state of manganese in fluoride is +4 (MnF(4)) but hig...

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

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  14. Why HCl not used to make the mdeium acidic in oxidation reactions of K...

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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 the...

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