relative atomic mass

• how to calculate the relative atomic mass

  mass number of isotope 1 x percent abundance + mass number of isotope 2 x percent abundance / 100
• isotope are atoms with the same amount of protons but different amount of neutrons
• abundance 


  how common each isotope is
• isotopic mass

  the average mass of all isotopes of a specific element
• relative atomic mass

  the average mass of atoms of an element relative to the mass of an atom of carbon -12