An isotope of lead has an atomic number of 82 and contains 125 neutrons. What is its isotope's mass number?

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An isotope of lead has an atomic number of 82 and contains 125 neutrons. What is its isotope's mass number?

Chemistry
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223
It's actually 82 + 125 which equals 207 amu
The atomic mass is the number of protons and neutrons together

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thanks and its she not he

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