30 pts estion 17 of 24 > O Macmillan Learning The half-lives of different radioisotopes are given in the table. Resources ? Hint Radioisotope argon-44 lead-196 potassium-44 indium-117 Half-life (min) 12 37 22 43 If the initial amount of argon-44 is 7.6 g, how much argon-44 is left in the body after 24 min? mass: g

What are the two principal differences between nuclear reactions and ordinary chemical changes?

A sample of rock was found to contain 8.23 mg of rubidium-87 and 0.47 mg of strontium-87.. (a) Calculate the age of the rock if the half-life of the decay of rubidium by emission is 4.71010 y. (b) If some S3887r was initially present in the rock, would the rock be younger, older, or the same age as the age calculated in (a)? Explain your answer.

The isotope 208Tl undergoes decay with a half-life of 3.1 min.. (a) What isotope is produced by the decay?. (b) How long will it take for 99.0% of a sample of pure 208Tl to decay?. (c) What percentage of a sample of pure 208Tl remains un-decayed after 1.0 h?