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Eight alpha decays and six beta decays are necessary before an atom of 2 \(^{238}_{92}U\)...

Physics
JAMB 1989
Eight alpha decays and six beta decays are necessary before an atom of 2 \(^{238}_{92}U\) achieves stability. The final product in the chain has an atomic number of
  • A. 70
  • B. 78
  • C. 82
  • D. 90
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Correct Answer: Option C
Explanation
U \(\to\) 8(\(^{4}_{2}He\)) + 6(\(^{0}_{-1}e\)) + \(^{b}_{a}X\)

92 = (8 X 2) + (6 X -1) + a

a = 82
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Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts