Outermost electronic configuration of a group 13 element, E, is 4s2, 4p1. The electronic configuration of an element of p-block period-five placed diagonally to element, E is :

Structure of Atom PYQ — JEE Main 2021 · 20 Jul · Shift 2 · Q5 with Solution

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Correct answer: D

Identify element $E$ from its valence configuration

Given outermost configuration of a group 13 element: $4s^2 4p^1$

General valence configuration of group 13 elements is: $ns^2 np^1$

Here, $n=4$ , so the element belongs to period 4 and group 13.

Thus, element $E$ is Ga (Gallium) with configuration: $[Ar]3d^{10}4s^24p^1$
Find the element placed diagonally in the p-block period 5

In the periodic table, the element diagonally down-right from Ga (group 13, period 4) will be in:
- group 14
- period 5
The period 5, group 14 element is Sn (Tin).
Write electronic configuration of Sn

Tin ( $Z=50$ ) has electronic configuration: $[Kr]4d^{10}5s^25p^2$
Match with the options
- A: $[Kr]3d^{10}4s^24p^2$ ❌ incorrect
- B: $[Ar]3d^{10}4s^24p^2$ ❌ this is Ge-like, period 4
- C: $[Xe]5d^{10}6s^26p^2$ ❌ this is Pb-like, period 6
- D: $[Kr]4d^{10}5s^25p^2$ ✅ correct
Final answer

The required electronic configuration is: $[Kr]4d^{10}5s^25p^2$

Hence, Option D is correct.