Which of the following factors may be regarded as the main cause of lanthanide contraction?

  • Option 1)

    Poor shielding of one of  4f electron by another in the subshell

  • Option 2)

    Effective shielding of one of  4f electrons by another in the subshell

  • Option 3)

    Poorer shielding of 5d electrons by 4f electrons

  • Option 4)

    Greater shielding of 5d electrons by 4f electrons

 

Answers (1)

As we learnt in

Lanthanoid contraction -

The filling of if orbits before 5d orbits result regular decrease in atomic radii called Lanthanoid contraction or can say the size of radii not much increase.

- wherein

e.g.\:\:\:\:3d\rightarrow 4d\rightarrow 5d

 

 

 In lanthanoid contraction shielding of one 4f electron on another 4f electron is less than shielding of one 5d electron on another 5d electron. 


Option 1)

Poor shielding of one of  4f electron by another in the subshell

This option is correct

Option 2)

Effective shielding of one of  4f electrons by another in the subshell

This option is incorrect

Option 3)

Poorer shielding of 5d electrons by 4f electrons

This option is incorrect

Option 4)

Greater shielding of 5d electrons by 4f electrons

This option is incorrect

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