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The emission spectrum of He+ ion is the consequence of transition of electrons from orbit n2 to orbit n1. Given that 2n2 + 3n1 = 18 and 2n2 - 3n1 = 6,...

December 20, 2025
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Atomic StructureBohr model calculations & atomic spectrum problemsMEDIUMJEE Chemistry
The emission spectrum of He+ ion is the consequence of transition of electrons from orbit n2 to orbit n1. Given that 2n2 + 3n1 = 18 and 2n2 - 3n1 = 6, then what will be the maximum number of spectral lines in atomic spectrum when electrons transit from n2 to orbit n1? **Options:** - **A.** 10 - **B.** 15 - **C.** 20 - **D.** 21 --- **Difficulty:** MEDIUM | **Chapter:** Atomic Structure | **Topic:** Bohr model calculations & atomic spectrum problems

Official Solution

## ✅ Correct Answer: **A** ### 📖 Detailed Explanation: **Solution:** **Analyzing each option:** (A) ✓ 10... (B) ✗ 15... (C) ✗ 20... (D) ✗ 21... **Correct Answer: (A)** **Key Concept:** Apply fundamental principles of atomic structure to identify the correct option. --- *This is an official solution provided by Chem Mantra. For more chemistry questions and solutions, explore our [question bank](/courses).*

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Atomic StructureBohr model calculations & atomic spectrum problemsMEDIUMJEE Chemistry