1. The problem statement, all variables and given/known data Referencing to the gross and fine structure, explain how the energy diagrams differ for Hydrogen and Sodium. What effect does this have on the observed spectra? 2. Relevant equations Sodium config: 1s21s22p63s1 Hydrogen : 1s1 3. The attempt at a solution I think that the diagram would be the same if you covered up the energy diagram before 3s. And I know that the spectra lines for "s" transitions are the brightest, with lines getting dimmer through the letters (p,d,f...). But I'm not to clear on what this means in reference to the gross and fine structures, nor if the energy gaps of the transitions have an effect on the brightness or just the wavelength of given off photons (I'd assume the brightness is due to the probability of a transition occurring)? (The question is worth 5 marks out of 20 so I suspect there's a lot to mention) Any help would be greatly appreciated, thanks in advance.