anonymous
  • anonymous
Write the identity of the missing nucleus for the following nuclear decay reaction 90Th232=88Ra228+
Chemistry
chestercat
  • chestercat
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taramgrant0543664
  • taramgrant0543664
Because the sums of both the top and bottom numbers (the mass number and atomic numbers) of each side must be equal, we know that the atomic number must be 2 because 88+2=90 and the mass number must be 4 so 228+4=232. Thus, because the atomic number is 2, you know this is helium so 4/2 He. This is a classic example of alpha decay. Sorry I would but it in the proper form if I was able to do the equations but I'm on my iPad so I am unable too!

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