JEE Main 2023 · PhysicsNumerical answerNumerical valueEasyCalculation

JEE Main 6 April 2023, Shift 1, Physics Q53

Question 53 of 90 in this shift, Physics question 23 of 30, Section B.

The radius of fifth orbit of the

\mathrm{Li^{++}}

is ____________

\times10^{-12}

m. Take: radius of hydrogen atom = 0.51 Å

Official answer

425

NTA final key.

Chapter: Atoms
Topic: Bohr's Atomic Model
Idea tested: Bohr Orbit Radius

Same idea in other shifts

Asked 6× in all

2 Apr 2025, Shift 2 · Q40Assuming the validity of Bohr's atomic model for hydrogen like ions the radius of $\mathrm{Li^{++}}$ ion in its ground state is given by…EasySingle correct
27 Jan 2024, Shift 1 · Q47The radius of third stationary orbit of electron for Bohr's atom is R. The radius of fourth stationary orbit will be :EasySingle correct
6 Apr 2023, Shift 2 · Q56Experimentally it is found that 12.8 eV energy is required to separate a hydrogen atom into a proton and an electron. So the orbital…MediumNumerical value
13 Apr 2023, Shift 1 · Q51The radius of $2^{\text{nd}}$ orbit of $\mathrm{He^+}$ of Bohr's model is $r_1$ and that of fourth orbit of $\mathrm{Be^{3+}}$ is…EasyNumerical value
30 Jul 2022, Shift 2 · Q17Using Boh'r model of quantization of angular momentum the relation between the radius 'r' of the n $^{\mathrm{th}}$ allowed orbit of…EasySingle 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.