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Usually, the base element name followed by the mass number 'A', such as Carbon-12. You can also use the atomic symbol preceded by the mass number as a superscript. Some isotopes have special names and atomic symbols: Hydrogen-2: Deuterium (D) Hydrogen-3: Tritium (T) Helium-2: Diproton (Theoretical, not actually possible because of physics-y stuff)

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16y ago

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