The Balmer series of hydrogenic spectral lines refers to an electron transitioning from n 3 to n=2 where n is the principal quantum number. A hydrogenic atom with atomic number Z=24 undergoes a Balmer transition of the largest possible wavelength. The emitted photon has energy E₀ . Another hydrogenic atom with atomic number Z=25 undergoes a similar Balmer transition with the energy of the emitted photon being E₁ . Th