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            This is a file from the  Wikimedia Commons. Information from its  description page there is shown below.  Commons is a freely licensed media file repository.  You can help. 
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        Summary 
        
         
          
           | Description | 
           
             English: Electron configuration (no language or descriptive labels) 
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           | Date | 
           23 October 2012, 13:24:01 | 
          
          
           | Source | 
            http://commons.wikimedia.org/wiki/Category:Electron_shell_diagrams (corresponding labeled version) | 
          
          
           | Author | 
            commons:User:Pumbaa (original work by  commons:User:Greg Robson) | 
          
         
         
        svg code adjusted from labeled version, reduced margin
        
         
        
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