· 4) Urn átomo X tem 74 neutrons e 53 protóns, seu isotopo Y, utilizado na medicina, tem 4...
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· 4) Urn átomo X tem 74 neutrons e 53 protóns, seu isotopo Y, utilizado na medicina, tem 4 unidades a mais em seu número de massa, sendo isóbaro de Z, Z tern 1 …
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