Phosphorus-31 is the most common isotope. (Wikipedia)
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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.
The most common isotope of carbon is Carbon-12, which has a mass number of 12.
The most common naturally occurring isotope of carbon is carbon-12, which has a mass number of 12.
Xenon has a variety of isotopes, each with a different number of neutrons. The most common isotope, Xenon-132, has 77 neutrons. To calculate the number of neutrons in a xenon isotope, subtract the number of protons (which is equal to the atomic number) from the mass number of the isotope.
The mass number of lead varies depending on the isotope. The most common isotope of lead, lead-208, has a mass number of 208.
The atomic number of nitrogen is 7, and the most common isotope of nitrogen, nitrogen-14, has a mass number of 14.