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Saturday, 31 October

JEE Main · Chemistry · Structure of Atom

Aufbau Principle and n+l Rule

JEE Main asked Aufbau Principle and n+l Rule 8 times in 8 of the 108 shifts Lumi analysed, in 2020, 2021, 2022, 2024 and 2026. It belongs to Quantum Numbers, in Structure of Atom (Chemistry). The longest wait between two years asking it was 2 years. In 2022 and 2026 it came in more than one shift of the same year.

Updated 2026-10-24

Times asked
8
in 8 shifts
Years
5 of 8
First asked
2020
last in 2026
Pattern
Asked most years
across the analysed shifts

Questions on this idea a shift, by year

2017–2026. Asked in 2020, 2021, 2022, 2024 and 2026. Years differ in how many shifts Lumi analysed, so each year is scaled to one shift of 25 Chemistry questions.

00.20.40’170.08’200.03’210.07’220’230.05’240’250.33’26

Raw count: 2017: 0 in 1 shift · 2020: 1 in 12 shifts · 2021: 1 in 24 shifts · 2022: 2 in 24 shifts · 2023: 0 in 12 shifts · 2024: 1 in 18 shifts · 2025: 0 in 8 shifts · 2026: 3 in 9 shifts.

Shift by shift

Each square is one analysed shift, in date order. Open a filled one for that paper.

  • 20263 of 9
  • 20250 of 8
  • 20241 of 18
  • 20230 of 12
  • 20222 of 24
  • 20211 of 24
  • 20201 of 12
  • 20170 of 1

Asked in that shift More than once Not asked

How JEE Main framed it

Single correct is the usual form. Skill tested: application.

  • Order/ranking of orbital energies
  • Quantum numbers of a given electron

Difficulty

Easy 4Medium 4Hard 0

1 of the 8 questions had a numerical answer.

Every question

All 8 questions

From the official JEE Main shift papers, newest first. Open one for the full question, the options and the official answer.

  1. 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)(n+l), the orbital with lower value of n…MediumOther
  2. 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=+1n = 3, l = 2, m = +1 B.…MediumOther
  3. 4 Apr 2026, Shift 1 · Q53Which of the following is correct set of 44 quantum numbers of 19th19^{\text{th}} electron in Chromium (Atomic number =24=24) in accordance…MediumSingle correct
  4. 9 Apr 2024, Shift 1 · Q61Compare the energies of following sets of quantum numbers for multielectron system. (A) n=4,l=1n=4, l=1 (B) n=4,l=2n=4, l=2 (C) n=3,l=1n=3, l=1 (D)…EasySingle correct
  5. 29 Jul 2022, Shift 2 · Q62Given below are the quantum numbers for 4 electrons. A. n=3,l=2,ml=1,ms=+1/2n = 3, l = 2, m_l = 1, m_s = +1/2 B. n=4,l=1,ml=0,ms=+1/2n = 4, l = 1, m_l = 0, m_s = +1/2 C.…MediumSingle correct
  6. 27 Jul 2022, Shift 2 · Q61The correct decreasing order of energy for the orbitals having, following set of quantum numbers : (A) n=3n=3, l=0l=0, m=0m=0 (B) n=4n=4,…EasySingle correct
  7. 22 Jul 2021, Shift 2 · Q53Number of electrons that Vanadium (Z=23) has in p-orbitals is equal to ________.EasyNumerical value
  8. 5 Sep 2020, Shift 1 · Q33In the sixth period, the orbitals that are filled are :EasySingle correct

Shifts: 5 Sep 2020, Shift 1, 22 Jul 2021, Shift 2, 27 Jul 2022, Shift 2, 29 Jul 2022, Shift 2, 9 Apr 2024, Shift 1, 4 Apr 2026, Shift 1, 5 Apr 2026, Shift 2, 5 Apr 2026, Shift 1.

Same topic

Other ideas in Quantum Numbers

Quantum Numbers has 23 ideas JEE Main has asked; 9 of them came up in more than one question. The 12 most asked are below.

Topic analysisChapter analysisStudy this chapterAll repeated ideas