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Saturday, 31 October

JEE Main · Chemistry · Structure of Atom

Anomalous Electron Configurations

JEE Main asked Anomalous Electron Configurations 4 times in 4 of the 108 shifts Lumi analysed, in 2022, 2024, 2025 and 2026. It belongs to Quantum Numbers, in Structure of Atom (Chemistry). The longest wait between two years asking it was 2 years.

Updated 2026-10-24

Times asked
4
in 4 shifts
Years
4 of 8
First asked
2022
last in 2026
Pattern
Frequent
across the analysed shifts

Questions on this idea a shift, by year

2017–2026. Asked in 2022, 2024, 2025 and 2026. Years differ in how many shifts Lumi analysed, so each year is scaled to one shift of 25 Chemistry questions.

00.10.20’170’200’210.03’220’230.05’240.13’250.11’26

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

Shift by shift

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

  • 20261 of 9
  • 20251 of 8
  • 20241 of 18
  • 20230 of 12
  • 20221 of 24
  • 20210 of 24
  • 20200 of 12
  • 20170 of 1

Asked in that shift More than once Not asked

How JEE Main framed it

Other is the usual form. Skill tested: application.

  • Count correct statements on atomic structure
  • Count electrons by azimuthal quantum number

Difficulty

Easy 3Medium 1Hard 0

Every question was multiple choice.

Every question

All 4 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 1 · Q53Identify the correct statements from the following : A. Heisenberg uncertainty principle is applicable to electrons. B. The size of 2px2p_x…EasyOther
  2. 4 Apr 2025, Shift 2 · Q51Consider the ground state of chromium atom (Z=24)(Z=24). How many electrons are with Azimuthal quantum number l=1l=1 and l=2l=2 respectively ?EasySingle correct
  3. 30 Jan 2024, Shift 1 · Q66Match List - I with List - II. List - I (Species) List - II (Electronic distribution) (A) Cr+2\mathrm{Cr^{+2}} (I) 3d83d^8 (B)…MediumMatch the list
  4. 29 Jun 2022, Shift 1 · Q62Which of the following statements are correct ? (A) The electronic configuration of Cr is [Ar] 3d5 4s13d^5\,4s^1. (B) The magnetic quantum…EasyOther

Shifts: 29 Jun 2022, Shift 1, 30 Jan 2024, Shift 1, 4 Apr 2025, 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