Use the following table to assist in answering the question below. Nuclide Half-

Question

Use the following table to assist in answering the question below. Nuclide Half-Life Uranium-238 4.51 10^2 years Uranium-234 2.48 10^3 years Thorium-230 8.0 10^4 years Radium-226 1.62 10^3 years Lead-210 20.4 years The rate constant for the decay of unstable nuclide X by alpha-particle emission is 4.21 10^-13/day. What is the identity of X? Radium-226 Thorium-230 Uranium-234 Uranium-238 Lead-210 ANS: D PTS: ! DIF: Easy REF: 19.2 KEY: Chemistry | general chemistry | nuclear chemistry | radioactivity and nuclear

Explanation / Answer

the rate constant and half life are related as

half life =0.693/K= 0.693/4.21*10-13 day= 1.6*1012 days =4.51*109 years

so the element is U-238.

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