How many electron(s) must be gained by an atom of Helium in order to fill the outer shell?        
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                                        2018-09-06T07:28:27-0400
                    
                                                    
                                The Helium atom does not have unpaired electrons and free shell. So the Helium atom can not receive  any electrons.                             
                                                 
                 
                    
        
            
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