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Phosphorus-31 is the most common isotope. (Wikipedia)

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βˆ™ 12y ago
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βˆ™ 5mo ago

The most common isotope of phosphorus is phosphorus-31. This means it has a mass number of 31, which is the sum of protons and neutrons in the nucleus.

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Q: What is the mass number of the most common isotope in phosphorous?
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