The half-life of isotope X is 2.0 years how many years would it take for a 4.0 mg sample of X to decay and have only 0.50 mg of it remain?

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... U-238 has a half-life of 4.46 x 10 9 years. ... How long will it take for a 64.0 g sample of Rn-222 (half-life = 3 ... 59.95 mg. Determine how many half-lives ... - Read more

The half-life ofisotope X is2.0 years. Howmany years would ittake fora 4.0 mg sample ... mgsample todecay and have only 1.25mgofitremain? - Read more

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