![]() ![]() So, # 2 * t_("1/2") = 1000 -> t_("1/2") = 1000/2 = 500#"years"#. Chemistry Chemistry questions and answers isotope name and symbol - cobalt-60, iodine-131,strontium-89, technetium -99,sodium-24 This problem has been solved Youll get a detailed solution from a subject matter expert that helps you learn core concepts. ![]() #100.0/2 = 50.0#"g"# after the first #t_("1/2")#, Cobalt60 and iodine131 are radioactive isotopes commonly used in nuclear medicine. In this case, since 25 represents 1/4th of 100, two hal-life cycles must have passed in 1,000 years, since Let's say you started with 100 g and ended up with 25 g after 1,000 years. ![]() Cobalt-60 is the longest-lived radioactive isotope of cobalt, with a half-life of 5.27 years. How many protons, neutrons, and electrons are in atoms of these isotopes Write the complete electron configuration for each isotope. Sometimes, if the numbers allow it, you can work backwards to determine an element's half-life. cobalt-60, radioactive isotope of cobalt used in industry and medicine. Answer: Cobalt60 and iodine131 are radioactive isotopes commonly used in nuclear medicine. So, the initial mass gets halved every 7.72 years. Cobalt-60 is the longest-lived radioactive isotope of cobalt, with a half-life of. Here's how you would determine its half-life: It started from a mass of 67.0 g and it took 98 years for it to reach 0.01 g. Let's say you have a radioactive isotope that undergoes radioactive decay. So, if a problem asks you to calculate an element's half-life, it must provide information about the initial mass, the quantity left after radioactive decay, and the time it took that sample to reach its post-decay value. Radioisotope Half-life Iodine - 131 8.07 days Cobalt - 60 5.26 years Carbon - 14 5730 years Uranium - 235 700 million years Group of answer choices carbon - 14 iodine - 131 cobalt - 60 Uranium - 235 Expert Answer 100 (6 ratings) Top Expert 500+ questions answered Ans. #t_("1/2")# - the half-life of the decaying quantity. #A_0# - the initial quantity of the substance that will undergo decay Exponential decay can be expressed mathematically like this: Nuclear half-life expresses the time required for half of a sample to undergo radioactive decay. ![]()
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