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Saturday, 31 October

JEE Main · Chemistry · The d- and f-Block Elements

Lanthanide Electronic Configuration

JEE Main asked Lanthanide Electronic Configuration 8 times in 8 of the 108 shifts Lumi analysed, in 2020, 2021, 2022, 2024 and 2026. It belongs to f-Block Elements, in The d- and f-Block Elements (Chemistry). The longest wait between two years asking it was 2 years. In 2020, 2021 and 2024 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.

00.10.20’170.17’200.07’210.03’220’230.09’240’250.11’26

Raw count: 2017: 0 in 1 shift · 2020: 2 in 12 shifts · 2021: 2 in 24 shifts · 2022: 1 in 24 shifts · 2023: 0 in 12 shifts · 2024: 2 in 18 shifts · 2025: 0 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
  • 20250 of 8
  • 20242 of 18
  • 20230 of 12
  • 20221 of 24
  • 20212 of 24
  • 20202 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: recall.

  • Pairs with equal 4f electron count
  • Electronic configuration of lanthanide

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. 4 Apr 2026, Shift 2 · Q59Pairs of elements with the same number of electrons in their respective 4f orbital are [Atomic number: Eu-63, Gd-64, Dy-66, Ho-67, Tm-69,…MediumOther
  2. 27 Jan 2024, Shift 1 · Q68The electronic configuration for Neodymium is : [Atomic Number for Neodymium 60]EasySingle correct
  3. 6 Apr 2024, Shift 1 · Q69The number of element from the following that do not belong to lanthanoids is Eu, Cm, Er, Tb, Yb and LuEasySingle correct
  4. 27 Jun 2022, Shift 2 · Q69The 'f' orbitals are half and completely filled, respectively in lanthanide ions [Given : Atomic no. Eu, 63; Sm, 62; Tm, 69; Tb, 65; Yb,…MediumSingle correct
  5. 25 Jul 2021, Shift 2 · Q58Number of electrons present in 4f orbital of Ho3+\mathrm{Ho^{3+}} ion is ________. (Given Atomic No. of Ho = 67)EasyNumerical value
  6. 4 Aug 2021, Shift 1 · Q40Match List I with List II List I List II A. Gadolinium (At. No. 64) I. 5f7,6d1,7s25f^7, 6d^1, 7s^2 B. Holmium (At. No. 67) II. 5f4,6d1,7s25f^4, 6d^1, 7s^2…MediumMatch the list
  7. 5 Sep 2020, Shift 1 · Q37The correct electronic configuration and spin-only magnetic moment (BM) of Gd3+\mathrm{Gd^{3+}} (Z=64Z = 64), respectively, are :EasySingle correct
  8. 9 Jan 2020, Shift 1 · Q36The electronic configurations of bivalent europium and trivalent cerium are : (atomic number : Xe = 54, Ce = 58, Eu = 63)MediumSingle correct

Shifts: 9 Jan 2020, Shift 1, 5 Sep 2020, Shift 1, 25 Jul 2021, Shift 2, 4 Aug 2021, Shift 1, 27 Jun 2022, Shift 2, 27 Jan 2024, Shift 1, 6 Apr 2024, Shift 1, 4 Apr 2026, Shift 2.

Same topic

Other ideas in f-Block Elements

f-Block Elements has 11 ideas JEE Main has asked; 4 of them came up in more than one question.

Topic analysisChapter analysisStudy this chapterAll repeated ideas