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(A) $1$. The shielding effect of $f$-orbitals is very poor. Specifically,the shielding provided by $4f$ electrons is much less than that provided by $

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

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(A) $1$. The shielding effect of $f$-orbitals is very poor. Specifically,the shielding provided by $4f$ electrons is much less than that provided by $5f$ electrons due to the more diffuse nature of the $5f$ orbitals. Thus,the statement that they are equally shielded is incorrect.$2$. $d$-block elements generally show regular trends in properties across a period,though they exhibit variable oxidation states.$3$. $La$ $([Xe] 5d^1 6s^2)$ and $Lu$ $([Xe] 4f^{14} 5d^1 6s^2)$ have partially filled $d$-orbitals and no other partially filled $f$-orbitals.$4$. Lanthanoids exhibit a high degree of similarity in their chemical properties because their $4f$ electrons are deeply buried and do not participate significantly in bonding.

Identify the incorrect statement among the following:

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