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Questão sobre radiotividade quimica
51-(UECE) Suponha um nuclídeo radioativo de número
atômico 90 e cujo número de massa seja 232. Suponha ainda que o referido nuclídeo emita sucessivamente uma partícula ? seguida de duas emissões ? e novamente uma emissão ?. Ao final, o átomo que encerra esta série de emissões terá em seu
núcleo:
a) 136 nêutrons
b) 138 nêutrons
c) 86 prótons
d) 90 próton
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