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OpenStudy (anonymous):
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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OpenStudy (anonymous):
223
OpenStudy (blank ):
It's actually 82 + 125 which equals 207 amu
OpenStudy (blank ):
The atomic mass is the number of protons and neutrons together
OpenStudy (anonymous):
thanks and its she not he
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