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OpenStudy (anonymous):
What is the mass number of superscript 207 over subscript 82 Pb? 289 207 125 82
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OpenStudy (midhun.madhu1987):
207 i think
OpenStudy (agreene):
\[\huge X_{a}^{b}\] with \(X\) being the atomic symbol \(a\) as atomic number \(b\) being number of protons/mass
OpenStudy (agreene):
I should actually say \(b\) is number of nucleons, not necessarily protons
OpenStudy (anonymous):
so it will be 207
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