(A) The shielding effect of $f-$orbitals is poor. Specifically,the $4f$ orbitals are closer to the nucleus than the $5f$ orbitals,meaning the shieldin

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$4f$ and $5f$ orbitals are equally shielded.

(A) The shielding effect of $f-$orbitals is poor. Specifically,the $4f$ orbitals are closer to the nucleus than the $5f$ orbitals,meaning the shielding provided by $4f$ electrons is greater than that provided by $5f$ electrons. Therefore,the statement that $4f$ and $5f$ orbitals are equally shielded is incorrect.

Class 12 Chemistry The d- and f-Block Elements General Characteristics

Medium

Identify the incorrect statement among the following:

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A
$4f$ and $5f$ orbitals are equally shielded.
B
$d-$ Block elements show irregular and erratic chemical properties among themselves.
C
$La$ and $Lu$ have partially filled $d-$orbitals and no other partially filled orbitals.
D
The chemistry of various lanthanoids is very similar.