Base your answer to this question on the table below and on your knowledge of Earth science. The table shows the disintegration products and half-lives of five commonly used radioactive isotopes. Radioactive Decay Data Radioactive Isotope Half-Life (years) Disintegration Carbon-14 5.7 x 10 k Ar Ca 2y Pb Potassium-40 1.3 x 10 Uranium-235 7.1 x 10 Uranium-238 4.5 x 10 Rubidium-87 "Rb "Sr 4.9 x 100 Which radioactive isotope takes the greatest amount of time to disintegrate? 1. potassium-40 2. uranium-235 3. uranium-238 rubidium-87

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