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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 of `4f` electron by another in the sub-shell

Text Solution

Verified by Experts

The correct Answer is:
D
Lanthanide contraction is due to poor shielding of one of `4f` electron by another in the sub-shell.
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RESONANCE ENGLISH-PERIODIC TABLE & PERIODICITY-Exercise
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  2. Identify the least stable ion amongst the following :

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  3. Assertion (A) : Pb^(+4) compounds are stronger oxidiising agents than...

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  4. Among the following, how many elements show only one non-zero oxidatio...

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  5. Which one of the following ions has the highest value of ionic radius?

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  6. The formation of the oxide ion O^(2-) (g) requires first an exothermic...

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  7. In which of the following arrangements, the order is not according to ...

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

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

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  10. The increasing order of the first ionisation enthalpies of the element...

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  11. Lanthanoid contraction is caused due to:

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  12. The stability of dihalides of Si, Ge, Sn and Pb increases steadily in ...

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  13. The set representing the correct order of ionic radius is

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  14. The correct sequence which shows decreasing order of the ionic radii o...

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  15. The outer electronic configuration of Gd (At.No. 64) is

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  16. the correct order of electron gain enthalpy with negative sign of F,Cl...

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  17. The increasing order of the ionic radii of the given isoelectronic spe...

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  18. Which of the following represents the correct order of increasing firs...

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  19. The first ionisation potential of Na is 5.1eV. The value of electron g...

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  20. The ionic radii (in Å) of N^(3-), O^(2-) and F^(-) are respectively :

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