Atomic Mass is so small you can't actually measure it. So, just like carbon dating, you have to use a relative mass.
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the relative atomic mass for the element potassium is 39.0983
Silver is a meta element. Atomic mass of it is 108.
The relative atomic mass is 83.798. So where did you get that it is not determined.
Sodium is a meta element. Atomic mass of it is 23.
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.