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Which missing item would complete this beta decay reaction?

Which missing item would complete this beta decay reaction?-example-1
User Futbolpal
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We know that the mass number (top number) must be 33 because the electron that is emitted has no mass. The atomic number (bottom number) must be 15, because it is one less than 16 and the electron has a negative charge. Therefore, the first box is the answer.
User TheLifeOfSteve
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