What fraction of Fr-220 remains unchanged after 82.2 seconds?
20
1/2
1/8
1/16

What fraction remains undecayed after 241.84 years (half life = 30.23 yrs)? 10. How many half-lives of K-37 will pass after 6.15 seconds (half life = 1.23 s)? 11. What fraction of Pu-239 (an artificially produced isotope used as a fuel in some nuclear fission reactors) remains undecayed after 219,600 years (half life = 24,000 yrs)? 12.

the correct answer is b. a strong acid completely dissociates to its ions when dissolved in water. completely dissociates to and ions. a is incorrect because does not fully ionize to and ions and some remain as the compound . c and d are incorrect because, and do not fall into the category of bronsted lowry acids. a bronsted lowry acid is a proton donor and since both molecules do not have a proton to donate they are not bronsted lowry acids. likewise,   if we use the lewis acid definition, they cannot be acids. a lewis acid is an electron pair acceptor. both and have a complete octet so can not accept any electrons which disqualifies them as acids.