Which s larger, an `He^(+)` ion with electron in 3rd orbit or `Li^(2+)` ion with electron in 5th orbit ?

Explanation

To determine which ion is larger, we will calculate the radius of both the \( \text{He}^+ \) ion with an electron in the 3rd orbit and the \( \text{Li}^{2+} \) ion with an electron in the 5th orbit using the formula for the radius of an electron in orbit:

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

where:
- \( r \) is the radius,
...