Identify the incorrect statement among the fo | vedclass

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(A) $1$. The shielding effect of $f$-orbitals is very poor. The shielding power follows the order $s > p > d > f$. Since $4f$ orbitals are more diffus

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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. The shielding power follows the order $s > p > d > f$. Since $4f$ orbitals are more diffused than $5f$ orbitals,their shielding ability differs,and they are not equally shielded.$2$. $d$-Block elements exhibit a wide range of oxidation states and chemical properties,but they are generally systematic within groups and periods,not 'erratic'.$3$. $La$ $([Xe] 5d^1 6s^2)$ and $Lu$ $([Xe] 4f^{14} 5d^1 6s^2)$ have partially filled $d$-orbitals and no other partially filled orbitals (as $4f$ is empty in $La$ and full in $Lu$).$4$. Lanthanoids show a high degree of similarity in their chemistry due to the lanthanoid contraction and the fact that the $4f$ electrons are deeply buried.$5$. Statement $A$ is incorrect because $4f$ and $5f$ orbitals have different shielding characteristics due to their different radial distribution and penetration.

Identify the incorrect statement among the following:

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