Isotopes and Relative Atomic Mass

• Isotope: Atoms of the same element with different numbers of neutrons.
• Relative Atomic Mass: average mass of all the isotopes of an element.
• Relative abundance: how much there is of each isotope compared to the total amount of the element in the world.
• Calculate relative atomic mass:

  1. Multiply the mass of each isotope by its relative abundance
  2. Add together
  3. Divide by the sum of the relative abundances