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Substance Mass Number Number of
Protons Neutrons Electrons
Carbon-14        
Lead-208        
Chlorine-35        
Uranium-238        
Oxygen-18        
Radium-223        

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Substance Mass Number Number of
Protons Neutrons Electrons
Carbon-14 14 6 8 6
Lead-208 208 82 126 82
Chlorine-35 35 17 18 17
Uranium-238 238 92 146 92
Oxygen-18 18 8 10 8
Radium-223 223 88 135 88

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