Subject :NSO     Class : Class 4 
                                                                            Subject :NSO     Class : Class 5 
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Subject :NSO     Class : Class 5 
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Subject :NSO     Class : Class 6 
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Subject :NSO     Class : Class 8 
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Subject :NSO     Class : Class 3 
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Subject :NSO     Class : Class 3 
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Subject :NSO     Class : Class 6 
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Subject :NSO     Class : Class 9 
                                                                            Ans 2:
Class : Class 9 
                                                                                                        
                                                                                                        ANS will be D as difference between 1st and 4th shell = 0 stating it has 2 valence electrons and difference between 2nd and 3rd shell is also 0,stating 2nd and 3rd shell have 8 electrons if you get time pls solve my forum questions thanks
                                                                                                    
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Subject :NSO     Class : Class 3 
                                                                            
 
   
