considere a tabela na qual I e II representam isotopos do cesio:
isotopo I II numero atomico  55 Y numero de massa  133 z numero de neutros X 80


Os valores de X,Y e z que completam corretamente a tabela sao, respectivamente:
a) 55, 40 e 78
b) 58, 58 e 123
c) 58,59 e 80
d)78,55 e 135
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