Question

Outermost electronic configuration of a group $13$ element, $E$ is $4s^2,4p^1.$ The electronic configuration of an element of p - block period - five placed diagonally to element $E$ is :
JEE (MAIN)-2021

• A. $\left[Kr\right]3d^{10}4s^{2}4p^2$
• B. $\left[Ar\right]3d^{10}4s^{2}4p^2$
• C. $\left[Xe\right]5d^{10}6s^{2}6p^2$
• D. $\left[Kr\right]4d^{10}5s^{2}5p^2$

Answer 1

The correct option is D $\left[Kr\right]4d^{10}5s^{2}5p^2$

The element $E$ belongs to group - 13 and period - 4. The element belonging to period -5 and placed diagonally to $E$ has the electronic configuration

$\left[Kr\right]4d^{10}5s^{2}5p^2$
Option D is the correct answer