The species having identical radii according to the Bohr's theory are : A. H (first orbit) B. He + (first orbit) C. He + (second orbit) D. Li 2+ (first orbit) E. Be 3+ (Second orbit) Choose the correct answer from the options given below:

Chemistry · Structure of Atom

JEE Main 2026 — 4 April, Evening Shift — Question 51

The species having identical radii according to the Bohr's theory are : A. H (first orbit) B. $\mathrm{He}^{+}$ (first orbit) C. $\mathrm{He}^{+}$ (second orbit) D. $\mathrm{Li}^{2+}$ (first orbit) E. $\mathrm{Be}^{3+}$ (Second orbit) Choose the correct answer from the options given below:

Option A:
A and C Only
Option B:
A and E Only
Correct
Option C:
B and E Only
Option D:
C and D Only

Answer: B

Step-by-step solution

A) → same (B) → same (C) → same (D) $\rightarrow \mathrm{r}=\frac{90 \times^{2}}{3}=\frac{90}{3}$ (E) → same

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Exam: JEE Main 2026
Paper: 4 April, Evening Shift
Subject: Chemistry
Chapter: Structure of Atom
Topic: Bohr's Model of Atom