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Question: Answered & Verified by Expert
In Bohr's model, atomic radius of the first orbit is $\gamma$, the radius of the $3^{\text {rd }}$ orbit, is
ChemistryStructure of AtomJEE Main
Options:
  • A $\gamma / 3$
  • B $\gamma$
  • C $3 \gamma$
  • D $9 \gamma$
Solution:
2662 Upvotes Verified Answer
The correct answer is: $9 \gamma$
$\quad r \propto n^2$
For $I^{\text {st }}$ orbit $\gamma=1$
For $III^{\text{rd}}$ orbit $=\gamma \propto 3^2=9$
So it will $9^\gamma$.

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