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) $[\mathrm{Rn}]\,5f^{12}\,6d^{0}\,7s^2$
(2) $[\mathrm{Rn}]\,5f^{11}\,6d^{0}\,7s^2$ Official answer
(3) $[\mathrm{Rn}]\,5f^{10}\,6d^{0}\,7s^2$
(4) $[\mathrm{Rn}]\,5f^{13}\,6d^{0}\,7s^2$

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 4× in all

8 Apr 2023, Shift 1 · Q80In chromyl chloride, the number of d-electrons present on chromium is same as in (Given at no. of Ti : 22, V : 23, Cr : 24, Mn : 25, Fe :…EasySingle correct
29 Jun 2022, Shift 1 · Q66The electronic configuration of Pt (atomic number 78) is :MediumSingle correct
25 Feb 2021, Shift 1 · Q39In which of the following pairs, the outer most electronic configuration will be the same ?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 108 of the 174 JEE Main shifts held from 2017 to 2026.