It is not observed in elements with even atomic numbers, because the nuclei have a spin quantum number of zero. Causing an effect similar to the isotope shift--which rarely occurs without the additional presence of this phenomenon-- it is so small as to not be observable by 
It is not observed in elements with even atomic numbers, because the nuclei have a spin quantum number of zero. Causing an effect similar to the isotope shift--which rarely occurs without the additional presence of this phenomenon-- it is so small as to not be observable by a normal spectroscope. Its genesis lay in an atomic nucleus spinning about its own axis and not the electron spin. For 10 points--what splitting of a spectral line is even smaller than the fine structure?
It is not observed in elements with even atomic numbers, because the nuclei have a spin quantum number of zero.