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Question

A hypothetical radioactive nucleus decays according to the following seriesblank subscript 72 A to the power of 180 not stretchy rightwards arrow with alpha on top A subscript 1 not stretchy rightwards arrow with beta to the power of minus on top A subscript 2 not stretchy rightwards arrow with alpha on top A subscript 3 not stretchy rightwards arrow with gamma on top A subscript 4 If the mass number and atomic number of A are respectively 180 and72. Then to atomic number and mass number of A will respectively be

  1. 69,171

  2. 70,172

  3. 68,172

  4. 69,172

The correct answer is:

69,172

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