Consider hydrogen and helium. Both have electrons in energy level 1. When the electrons move from level 1 to a higher level, are the energy quantum the same for the electrons in hydrogen as in helium? If so, then how can one distinguish hydrogen from helium by observing the emitted light? Also, is there a table of acceptable energy levels of electrons vs the element itself? i.e. is there a table that shows the energy levels of hydrogen vs helium vs sodium for example.