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Nuclear Chemistry : Half-Life Quiz
When two nuclei have the same atomic number, but different atomic masses, then they are said to be isotopes. Isotopes have the same chemical properties but different physical properties. For example, carbon has two isotopes, C-12 and C-14. Both have the same atomic number of 6, but have different numbers of neutrons. C-14 has two extra neutrons, is radioactive and undergoes radioactive decay.
Half-life is the amount of time required for half of a quantity of a radioactive element to decay. Carbon-14 has a half-life of 5730 years. That is, if you take one gram of C-14, half of it will decay in 5730 years.
Cobalt-60 5 years
Protactinum-226 2 minutes
Iodine-131 8 days
Americium-242 6 hours
Tin-126 100,000 years
This quiz covers half-life. Use the above information to answer the following questions. Select the best answer from the choices.
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