a) 20 protonów, 20 elektronów, 20 neutronów
b) 8 protonów, 8 elektronów,8 neutronów
c) 14 protonów, 14 elektronów, 14 neutronów
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a) 20 protonów, 20 elektronów, 20 neutronów
b) 8 protonów, 8 elektronów,8 neutronów
c) 14 protonów, 14 elektronów, 14 neutronów