Although naturally occurring potassium consists mostly of the isotope of mass number 39
Chapter 19, Problem 16(choose chapter or problem)
Although naturally occurring potassium consists mostly of the isotope of mass number 39 (93.25%), isotopes of mass number 41 (6.73%) and 40 (0.01%) also are present. Write the nuclear symbol for each of the isotopes of potassium. How many neutrons are present in each isotope? Is the average atomic mass of potassium (39.10 g) consistent with the relative abundances of the isotopes?
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