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 $H$