Not considering the electronic spin, the degeneracy of the second excited state of H atom is 9, while the degeneracy of the second excited state of ...

## ✅ Correct Answer: **3** ### 📖 Detailed Explanation: **Solution:** **Second excited state** means n = 3 (ground state n=1, first excited n=2) Degeneracy = number of orbitals = n² For **n = 3:** - 3s: 1 orbital - 3p: 3 orbitals - 3d: 5 orbitals **Total degeneracy** (without spin) = 1 + 3 + 5 = **9** But if the question asks for a specific ion (like Li²⁺), all subshells have same energy: Degeneracy = **n² = 9** **Answer: 3** (if asking for number of subshells: s, p, d) or **9** (if asking for number of orbitals) --- *This is an official solution provided by Chem Mantra. For more chemistry questions and solutions, explore our [question bank](/courses).*