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Reason of lanthanoid contraction is...

Reason of lanthanoid contraction is

A

Negligible scrrening effect of f orbitals

B

Increasin nuclear charge

C

Decreasing nuclear charge

D

Decreasing screening effect

Text Solution

Verified by Experts

The correct Answer is:
A
The sphape of f-orbitals is very much diffused and they have poor shielding effect. The effective nuclear charge increase which causes the contraction in the size of electron charged cloud. This contraction in the size is quite regular and known as lanthanoid contraction.
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DISHA PUBLICATION-THE D- AND F- BLOCK ELEMENTS -EXERCISE - 1 CONCEPT BUILDER (TOPIC 3: LANTHANOIDS AND ACTINOIDS)
  1. The radius La^(3+) (Z= 57) is 106 pm . Which one of the following give...

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  2. Which of the following can be associated with the concept of Lanthanoi...

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  3. What is the percentage of lanthanoid metal in mischmetall ?

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  4. Among the lanthanoids, the one obtained buy synthetic method is

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  5. Which of the following elements shows maximum number of different oxid...

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  6. Which of the following factors may be regarded as the main cause of la...

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  7. The heavisest atom oamongst the following is

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  8. Which of the following ions will exhibit colour in aqueous solution ?

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  9. Which of the following exhibit only + 3 oxidation state ?

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  10. Which of the following lanthanoid ions is diamagnetic ? (At nos . Ce...

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  11. Reason of lanthanoid contraction is

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  12. Because of lanthanoid contraction, which of the following pair sof ele...

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

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  14. The electronic configuration of Eu (Atomic No. 63), Gd (Atomic No. 64)...

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  15. The reason for greater range of oxidation state in actinoids is attrib...

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  16. Non - lanthanoid atom is

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  17. Which of the following lanthanoid ions is diamagnetic ? (At nos Ce ...

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  18. Lanthanoid contraciton can be observed in

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  19. Which is not correct statements ? (At. Nos. Ce = 58, Lu = 71 , Yb =7...

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  20. Which of the following statement concerning lanthanides elements is fa...

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