What is the relation between radius, order of orbit, and nuclear charge for hydrogen-like species?
- A$r_n = \frac{a_0 n^2}{z} \text{ pm}$
- B$r_n = \frac{a_0 n^2}{z^2} \text{ pm}$
- C$r_n = \frac{a_0 n}{n^2} \text{ pm}$
- D$r_n = \frac{a_0 z}{n^2} \text{ pm}$
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