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CGP EDU Academic Team
Published on: August 14, 2026
Not considering the electronic spin, the degeneracy of the second excited state (n = 3) of H atom is 9, while the degeneracy of the second excited state of H – is :
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Single electron species don't follow the 
rule but multi electron species do
Ground state of 
First excited state of 
Second excited state of 
(3 degenerate orbitals)
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