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Friday, 9 October

JEE Main 2024 · ChemistryMultiple choiceSingle correctMediumRecall

JEE Main 9 April 2024, Shift 2, Chemistry Q66

Question 66 of 90 in this shift, Chemistry question 6 of 30, Section A.

The electronic configuration of Einsteinium is : (Given atomic number of Einsteinium = 99)
  1. (1)[Rn] 5f12 6d0 7s2[\mathrm{Rn}]\,5f^{12}\,6d^{0}\,7s^2
  2. (2)[Rn] 5f11 6d0 7s2[\mathrm{Rn}]\,5f^{11}\,6d^{0}\,7s^2Official answer
  3. (3)[Rn] 5f10 6d0 7s2[\mathrm{Rn}]\,5f^{10}\,6d^{0}\,7s^2
  4. (4)[Rn] 5f13 6d0 7s2[\mathrm{Rn}]\,5f^{13}\,6d^{0}\,7s^2

Official answer

Option 2

NTA final key.

Chapter
The d- and f-Block Elements
Topic
d-Block Elements
Idea tested
Electronic Configuration

Same idea in other shifts

Asked 2× in all
  1. 29 Jun 2022, Shift 1 · Q66The electronic configuration of Pt (atomic number 78) is :MediumSingle 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.