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How many protons are in the radioactive isotope 40/19K?
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How many protons are in the radioactive isotope 40/19K?

User Muammar
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First we have to establish that the number of protons is equivalent to the atomic number of element. Here I am assuming that you are referring to Potassium (K) - 40. Potassium, stable or unstable has 19 protons.
User Taylor Johnson
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