Question

Rank the $4p$, $4d$ and $4f$ orbitals of increasing degree to which the electrons present in them are shielded by inner electrons?

• A. $4d>4f>4p$
• B. $4f>4d>4p$
• C. $4p>4d>4f$
• D. $4d>4p>4f$

Answer 1

Answer: (B)

$4f>4d>4p$

The order of shielding effects by various orbitals is as follows :

$s>p>d>f$

We know that the order of filling of electrons is $4p$ followed by $4d$ and then $4f$

$\Rightarrow$ The inner electrons are more shielded than outer electrons thus, increasing order to which electrons in $4f,4p,4d$ are shielded is $4f>4d>4p$.

Hence, the correct option is B.