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23 February, 16:33

What is the mass number of an atom with 5 proton and 7 neutrons

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Answers (2)
  1. 23 February, 16:39
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    So the element is boron, so its mass number is 12.
  2. 23 February, 16:53
    0
    Its boron and the answer is going to be 12
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