Identify the incorrect statement among the following.A. The chemistry of varius lanthanoids is very similar.B. `4f` and `5f` orbitals are equally shieldedC. d-block element show irregular and erratic chemical properties among themselves.D. La and Lu have partially filled d orbitals and no other partially filled orbitals.

Identify the incorrect statement among the following.A. The chemistry

1.	Identify the incorrect statement among the following.A. The chemistry of varius lanthanoids is very similar.B. `4f` and `5f` orbitals are equally shieldedC. d-block element show irregular and erratic chemical properties among themselves.D. La and Lu have partially filled d orbitals and no other partially filled orbitals.
Answer» Correct Answer - 2 The decrease in the force of attraction exerted by the nucleus on the valency electrons due to presence o electrons in the inner shells is called shielding effect.An `4f` orbital is nearer to the nucleus than `5f` orbitals. In addition , tha `20` electrons of `3d` and `4d` orbitals contributed the shielding to `4f` electron while `44` electrons of `3d,4d,5d` and `4f` contributed the shielding to `5f`. Hence shielding of `5f` is more than `4f`.

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