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Question

Which one of these is the heaviest known stable nuclide?

A
Pb208
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B
Pb206
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C
Pb210
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D
Pb204
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Solution

The correct option is A Pb208
Lead's four stable isotopes each have 82 protons, a magic number in the nuclear shell model of atomic nuclei. The isotope lead-208 also has 126 neutrons, another magic number, and is hence double magic, a property that grants it enhanced stability: lead-208 is the heaviest known stable nuclide.

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