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Atomic weight (AW)

• Atomic Weight is now an obsolete term for Relative Atomic Mass (r.a.m. - symbol A_r )
  
  
• The atomic weight of an element is an arbitrary weight/mass number, called a dalton, relative to other elements.
  
  
• It was determined that 12 grams of carbon contained 6.0 * 10²³ atoms. Giving carbon an atomic weight of 12.
  
  
• The atomic weights of other elements are the weight of 6.0 * 10²³ atoms of that element.
  
  
• Because many elements have isotopes (a variant with extra neutrons) the average mass of the natural isotope distribution is used.
  
  
• For a list of AWs see the table