Solved UPSC CDS/OTA Question
A solved UPSC CDS/OTA PYQ — decoded step-by-step.
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Q · Structure of the AtomMedium · 45s
The total number of orbitals in the third shell is:
TopicStructure of the Atom
Question Typemultiple choice
DifficultyMedium
Marking+1 / −0.33
Test Duration30 min
Step-by-Step Solution
The complete worked solution.
Every step explained — no skipped algebra.
For n=3, total orbitals = n² = 9.
Final Answer: Option C — 9