Calculate the radius of Bohr's 3rd orbit in `Li^(+2)` ion

Explanation

To calculate the radius of Bohr's 3rd orbit in the `Li^(+2)` ion, we will use the formula for the radius of the nth orbit in a hydrogen-like atom:

\[ r_n = \frac{n^2}{Z} \times r_0 \]

where:
- \( r_n \) is the radius of the nth orbit,
- \( n \) is the principal quantum number (which is 3 for the 3rd orbit),
- \( Z \) is the atomic number of the ion,
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