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Whats relative atomic mass
The mean mass of an atom of an element compared to 1/12th of the mass of a carbon-12 atom.

Whats relative isotopic mass
The mass of an atom of isotope compared to 1/12th of the mass of a carbon - 12 atom,
Key facts about relative isotopic mass
There is one relative isotopic mass for each isotope of an element
Relative isotopic mass is always a whole number, never a decimal
Relative isotopic mass has no units
Relative atomic mass equation
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