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A radioactive isotope M decays by emitting two alpha and a beta particle to form 206 83Y.

  1. What was the atomic number of M 
  2. After 224 days 1/16 of mass of M remained. Determine the half-life of M.

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  1. Atomic number = 83 + 4 -1 = 86
  2.   
    • sukchempp1ANS19b
      There are 4 t½ 
      4 t½ = 224 
      t½ = 56 days

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