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Understanding atomic notation: Mass number, atomic number, and element symbol explained.

A diagram showing the notation for a carbon atom, with the mass number 12 (protons + neutrons) and atomic number 6 (protons), labeled around the element symbol C.

A diagram showing the notation for a carbon atom, with the mass number 12 (protons + neutrons) and atomic number 6 (protons), labeled around the element symbol C.

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