Thorium is transformed after the transmission of a beta particle into:
Correct answer: B. Protactinium
- A. Bismuth
- B. Protactinium
- C. Polonium
- D. Palladium
Explanation
Thorium-234 has a half-life of 24.1 days, emitting a beta particle that results in its transformation to protactinium-234. In this way, the decay equation is obeyed. In beta decay, the mass number remains the same, but the atomic number is increased by 1. In the case of Thorium, after beta decay, a sepia with Atomic number 91 and mass number 234 should be formed.
This question appeared on the UHS MDCAT 2016 paper, which you can sit online with every answer explained.
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About Radioactive Decay
Radioactive decay is the spontaneous transformation of unstable nuclei, described by decay constant, activity, half life and the exponential decay law. Work includes alpha, beta and gamma emissions, decay equations and remaining nuclei, with half life distinguished from the time required for complete decay.
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