Energy-level diagram for a
complex or multi-electron atom
(©2002, François G. Amar, All rights reserved)

For complex atoms the following approximate diagram is appropriate
 
 

n=4    ______                          ____ ____ ____ ____ ____
        4s       ____ ____ ____                 3d
n=3    ____            3p
        3s                                                              
   
                                                              
                 ____ ____ ____                    
n=2    ____            2p 
        2s
                        
   
   
   
n=1    ____
        1s

 

 
 
 

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