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Apiece of radioactive element has initially \(8.0 \times 10^{27}\) atoms. Halflife is ...

Apiece of radioactive element has initially \(8.0 \times 10^{27}\) atoms. Halflife is two days. After 16 days the number of atoms is ____________

A. \(5 \times 10^{21}\)
B. \(5 \times 10^{22}\)
C. \(2 \times 10^{22}\)
D. \(2 \times 10^{21}\)





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