Moderate
A radioactive nucleus "X" undergoes a series of decays according to the following scheme.X → X1 + αX1 → X2 + βX2 → X3 + αX3 → X4 + γIf mass number and atomic number of "X" are 180 and 72 respectively, then the corresponding numbers for "X4" are:
Correct answer: B. 172,69
- A. 176,69
- B. 172,69
- C. 176,71
- D. 172,71
Explanation
Z =72 - 2 + 1 - 2 - 0 = 69A =180 - 4 - 0 - 4 - 0 = 172
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Atomic nuclei contain protons and neutrons, with nuclear size, mass defect and binding energy describing their stability. The work covers alpha, beta and gamma decay, decay equations, half-life and decay rate, along with radiation safety and medical applications such as imaging, radiotherapy and tracers.
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