(Answered) Consider the case of a radioactive element x which decays

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Consider the case of a radioactive element X which decays by electron (beta) emission with a half-life of 4 days to a stable nuclide of element Z. Which of the following statements is CORRECT?

(a) After 8 days the sample will consist of one-fourth element Z and three-fourths element X.

(b) Element Z will weigh exactly the same as element X when decay is complete (weighed to an infinite number of significant figures).

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