Chemistry / Chem 2496 · Atom · ~20 seconds
Nuclide Notation
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A nuclide is identified by mass number (protons plus neutrons) and atomic number (protons alone); so isotopes, per Chem 0221/0225, share atomic number but differ in mass number.
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Carbon-14 has the same six protons as ordinary carbon-12 but carries two additional neutrons.
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Mass number and atomic mass differ; mass number counts nucleons, while atomic mass is the nuclide's measured mass in amu.