2.1.2 - Relative Mass

• Relative atomic mass is the weighted mean mass of an atom of an element relative to 1/12th of the mass of an atom of carbon-12
• the weighted mean mass takes account of:

  • percentage abundance of each isotope
  • the relative isotopic mass of each isotope
• relative isotopic mass is the mass of an isotope relative to 1/12th of the mass of an atom of carbon-12