Francium-223 has a half-life of 21.80 min.
i. How many nuclei are initially present in a 25.0-mg sample of Francium-223?
ii. What is its initial activity?
iii. How many nuclei will be present 1hr and 49 min later?
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There is only one nuclei for any atom.There is no link between nuclei and time.
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