Lead has four stable isotopes and several unstable (radioactive) isotopes. The four stable isotopes of lead are: 1. **Lead-204 (\(^{204}\)Pb)**: This isotope has 82 protons and 122 neutrons. It is the least abundant stable isotope of lead. 2. **Lead-206 (\(^{206}\)Pb)**: This isotope has 82 protons and 124 neutrons.
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