Calculating Ar (Relative Atomic Mass/RAM):
- The Ar of an element is defined as the average mass of its isotopes compared with one- twelth of the mass of one atom of Carbon 12
- Carbon 12 has a mass of 12 therefore, one-twelth of the mass of one atom of Carbon 12 is 1
- To calculate Ar you use the equation:
Average mass of isotopes of the elements =