Using known values for hydrogen atom, calculate radius of third orbit for `Li^(+)`

Explanation

To calculate the radius of the third orbit for the lithium ion \( \text{Li}^+ \), we can use the formula for the radius of the nth orbit of an atom:

\[ r_n = \frac{n^2 a_0}{Z} \]

Where:
- \( r_n \) is the radius of the nth orbit,
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