Maths & Science With Eve Global Channel
                                
                            
                            
                    
                                
                                
                                June 19, 2025 at 02:04 PM
                               
                            
                        
                            ✅ *Correct answer: (a) Protons and neutrons 🤩*
*Explanation:*  
*Mass number* = Number of *protons* + Number of *neutrons*  
Electrons have negligible mass.
                        
                    
                    
                    
                    
                    
                                    
                                        
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