it is 27.
=)
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the relative atomic mass for the element potassium is 39.0983
Aluminium is a non metal element. Atomic mass of it is 26.982.
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.