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If a radioactive element with a half-life (t1/2) of 100 years has 31.5 kg remaining after 400 years of decay, the amount in the original sample was close to

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If a radioactive element with a half-life (t<sup>1/2</sup>) of 100 years has 31.5 kg remaining after 400 years of decay, the amount in the original sample was close to






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