Pattern 4 proton distributions; only belong to period six and period seven. A total of eight elements, for the sixth period, to fill the full four F protons as of the elements Nd 60; for the seventh period, to fill the full four F protons as of the elements U92.
1  | 
    2  | 
    3  | 
    4  | 
  
La  | 
    Ce  | 
    Pr  | 
    Nd  | 
  
Ac  | 
    Th  | 
    Pa  | 
    U  | 
  
For the Nd 142 nuclide, the four F proton located on  the hollow layer, is shown below:
Nd    142 
Proton:    60 
Neutron:    82
Spin:0
Stable 


For the U238 nuclide, the four F proton located on  both top layer and bottom layer, is shown below:
  
  U    238 
Proton: 92
Neutron:    146
Spin:    0

