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Which of th following factor may be rega...

Which of th following factor may be regarded as the main cause of Lanthanide contraction?

A

Greater shielding of `5d` electrons by `4f` electrons

B

Poorer shielding of `5d` electron by `4f` electrons

C

Effective shielding of one of `4f` electrons by another in the sub-shell.

D

Poor shielding of one `4f` electrons by another in the sub -shell.

Text Solution

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The correct Answer is:
4
Lanthanide contraction is due to poor shielding of one of `4 f` enectron by another in the sub-shell.
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RESONANCE ENGLISH-D BLOCK ELEMENTS-EXERCISE-3 PART-II
  1. Which of the following group of transition metals is called coinage me...

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  2. The number of d-electrons retained in Fe^(2+) (At. No Fe=26) ions are:

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  3. Ammonia form the complex ion[Cu(NH(3))(4)]^(2+) with copper ions in th...

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  4. The radius of La^(3+)(Z=57) is 106 pm. Which one of the following give...

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  5. Cerium (Z = 58) is an important member of the lanthanoids. Which of th...

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  6. The lanthanide contraction is responsible for the fact that (a)Zr and...

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  7. Which of th following factor may be regarded as the main cause of Lant...

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  8. The spin-only magnetic moment [in units of Bohr magneton, (mu(B) of Ni...

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  9. Lanthanoid contraction is caused due to:

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  10. Identify the incorrect statement among the following.

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  11. The actinoids exhibit more number of oxidation states in general than ...

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  12. More number of oxidation states are exhibited by the actinides than th...

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  13. In context with the transition elements, which of the following statem...

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  14. Knowing that the chemistry of lanthanoids (Ln) is dominated by its +3 ...

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  15. The correct order of E(M^(2+)//M)^@ value with negative sign for the f...

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  16. In context of the lanthanoids , which of the following statement is no...

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  17. The outer electrons configuration of Lu (Atomic No.,71) is :

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  18. Iron exhibits +2 and +3 oxidation states. Which of the following state...

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  19. Which of the following arrangements does not represent the correct ord...

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  20. Four successive members of first row transition element are listed bel...

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