Atomic mass is the measure of a mass of one atom in relation to 1/12 mass of Carbon 12 atom and measured in Atomic Mass unit(amu) or Dalton unit or grams/mol.
Relative atomic mass is also the relative mass but does not have a unit but a ratio number.
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Each element on the periodic table has two numbers: the atomic number and the relative atomic mass. The atomic number is the number of protons in the nucleus, and the relative atomic mass is the total number of protons and neutrons (so the difference between them is the number of neutrons). The relative atomic mass is always the higher of the two.
the relative atomic mass for the element potassium is 39.0983
Atomic mass is so small you can't actually measure it. So, just like carbon dating, you have to use a relative mass.
Silver is a meta element. Atomic mass of it is 108.
Sodium is a meta element. Atomic mass of it is 23.