222 86 rn - sandi 86

For example: the half-life of \(\ce{^{209}_{83}Bi}\) is 1. mobil toyota gt 86 9 × 10 19 years; \(\ce{^{239}_{94}Ra}\) is 24,000 years; \(\ce{^{222}_{86}Rn}\) is 3 82 days; and element-111 (Rg for roentgenium) is 1 5 × 10 –3 seconds The half-lives of a number of radioactive isotopes important to medicine are shown in Table \(\PageIndex{1}\), and others are