Chemistry · Structure of atom

For hydrogen-like species containing only one electron, the radius of the \( n^{\text{th}} \) orbit is proportional to:

1. \( \frac{Z^2}{n} \)
2. \( \frac{Z}{n^2} \)
3. \( \frac{n}{Z^2} \)
4. \( \frac{n^2}{Z} \)