Cause of lanthanoid or actinoid contraction

1. A.
   Poor shielding of one of 4f electron by another in the sub-shell.
2. B.
   Effective shielding of one of 4f electrons by another in the subshell
3. C.
   Poorer shielding of 5d electrons by 4f electrons
4. D.
   Greater shielding of 5d electrons by 4f electrons

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1. A.
   The shielding effect of electrons present in 4f and 5f orbitals is equal
2. B.
   The azimuthal quantum numbers of 4f and 5f are same
3. C.
   Poor shielding is offered by 5f electrons compared to 4f electrons in actinoids.
4. D.
   4f orbitals are more diffused as compared to 5f orbitals

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