JEE Main 2026 · ChemistryMultiple choiceSingle correctMediumApplication

JEE Main 4 April 2026, Shift 1, Chemistry Q53

Question 53 of 75 in this shift, Chemistry question 3 of 25, Section A.

Which of the following is correct set of

4

quantum numbers of

19^{\text{th}}

electron in Chromium (Atomic number

=24

) in accordance with Aufbau principle?

(1) $n=3,\ l=2,\ m=+2,\ s=+\frac12$
(2) $n=3,\ l=2,\ m=-2,\ s=+\frac12$
(3) $n=4,\ l=1,\ m=0,\ s=+\frac12$
(4) $n=4,\ l=0,\ m=0,\ s=+\frac12$ Official answer

Official answer

Option 4

NTA final key.

Chapter: Structure of Atom
Topic: Quantum Numbers
Idea tested: Aufbau Principle and n+l Rule

Same idea in other shifts

Asked 4× in all

5 Apr 2026, Shift 1 · Q52Arrange the following atomic orbitals of multi electron atoms in order of increasing energy. A. $n = 3, l = 2, m = +1$ B.…MediumOther
5 Apr 2026, Shift 2 · Q52Which of the following statement(s) is/are true ? A. If two orbitals have the same value of $(n+l)$ , the orbital with lower value of n…MediumOther
9 Apr 2024, Shift 1 · Q61Compare the energies of following sets of quantum numbers for multielectron system. (A) $n=4, l=1$ (B) $n=4, l=2$ (C) $n=3, l=1$ (D)…EasySingle correct

Question text from the official JEE Main paper published by NTA; answer from the final answer key. Chapter, topic and idea tags, difficulty and skill are Lumi’s. Lumi analyses 42 of the 174 JEE Main shifts held from 2017 to 2026.