Question SLPaper 1AAnswerWhat statement is not true about radioactive decay?AThe percentage of radioactive nuclei of an isotope in a sample of that isotope after 7 half-lives is smaller than 1%.BThe half-life of a radioactive isotope is the time taken for half the nuclei in a sample of that isotope to decay.CThe whole-life of a radioactive isotope is the time taken for all the nuclei in a sample of that isotope to decay.DThe half-life of radioactive isotopes range between extremely short intervals to thousands of millions of years.
