![]() The number of neutrons in a nucleus affects the mass of the atom but not its chemical properties. If you want to calculate how many neutrons an atom has, you can simply subtract the number of protons, or atomic number, from the mass number. Together, the number of protons and the number of neutrons determine an element’s mass number: mass number = protons + neutrons. How is the atomic mass of an element calculated? 6 What is the formula for finding atomic mass?.5 What is the average atomic mass of an isotope?. ![]() 4 How do you find the atomic number of an isotope?.3 When you calculate an atomic mass you take into account the atomic mass of each isotope and each isotopes?.2 How are isotopes related to atomic mass?.1 How is the atomic mass of an element calculated?.
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