The energy levels for a hydrogen-like species with atomic number $Z$ can be given by:
- A$E_n$ for species $= Z^2 \times E_n$ for $H$
- B$E_n$ for species $= Z \times E_n$ for $H$
- C$E_n$ for species $= \frac{1}{Z^2} \times E_n$ for $H$
- D$E_n$ for species $= \frac{1}{Z} \times E_n$ for $H$
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