Which of the following elements are exception | vedclass

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(C) The $(n + l)$ rule (also known as the Aufbau principle) states that electrons fill orbitals in order of increasing $(n + l)$ values.For $La$ $(Z=5

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Both $(a)$ and $(b)$

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(C) The $(n + l)$ rule (also known as the Aufbau principle) states that electrons fill orbitals in order of increasing $(n + l)$ values.For $La$ $(Z=57)$,the configuration is $[Xe] 5d^1 6s^2$. According to the $(n + l)$ rule,the $4f$ orbital $(n=4, l=3, n+l=7)$ should be filled before the $5d$ orbital $(n=5, l=2, n+l=7)$. However,the electron enters the $5d$ orbital instead of the $4f$ orbital.Similarly,for $Ac$ $(Z=89)$,the configuration is $[Rn] 6d^1 7s^2$. The electron enters the $6d$ orbital instead of the $5f$ orbital.Thus,both $La$ and $Ac$ are exceptions to the $(n + l)$ rule.

Column-$I$	Column-$II$
$A$. The orbital which has two angular nodes	$P$. $4d_{x^2-y^2}$
$B$. The $d$ orbital with zero nodal plane	$Q$. $3d_{z^2}$
$C$. The orbital with two radial nodes	$R$. $4f$
$D$. The orbital with three angular nodes	$S$. $3s$

Which of the following elements are exceptions to the $(n + l)$ rule?

Similar Questions

Match the column:

Column-$I$ Column-$II$

$A$. The orbital which has two angular nodes $P$. $4d_{x^2-y^2}$

$B$. The $d$ orbital with zero nodal plane $Q$. $3d_{z^2}$

$C$. The orbital with two radial nodes $R$. $4f$

$D$. The orbital with three angular nodes $S$. $3s$

Correct match will be $:-$

The maximum number of electrons accommodated in $5f$ orbitals are

Which of the following orbitals is impossible?

Which of the following pairs of atoms or ions have the same electronic configuration?

Which of the following ions has $18$ electrons in its outermost shell?

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