21785At undergoes two alpha decays and one beta decay to form nuclide, X. Which of the following represents the nuclide 'X'?
Correct answer: C. 20982Pb
- A. 21785At
- B. 21577Ir
- C. 20982Pb
- D. 21781Tl
Explanation
According to the equation:21785At → 20982X + 2 42He + 0-1e
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