When β -particle is emitted from lead(82Pb212), the mass number and charge number of bismuth formed are
Correct answer: A. 83Bi212
- A. 83Bi212
- B. 81Bi210
- C. 85Bi210
- D. None of these
Explanation
When a β-particle, which is an electron, is emitted from the nucleus during beta decay, a neutron is transformed into a proton. As a result, the atomic number (proton number) of the element increases by 1, but the mass number remains unchanged. Therefore, when a β-particle is emitted from lead (82Pb212), the resulting element is bismuth with an atomic number of 83 and a mass number of 212, denoted as 83Bi212. Option A correctly reflects these changes. Option B has an incorrect atomic number and mass number, while Option C incorrectly increases the atomic number by more than 1. Option D is incorrect as there is a valid answer among the provided options.
This question appeared on the ETEA MDCAT 2006 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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