it is usually the mass without the x10^-31
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the relative atomic mass for the element potassium is 39.0983
slightly more than 14, carbon 12 has an atomic mass of 12 by definition, so 1 atomic mass = the sum of the mass of a proton neutron and electron divided by 2 neutrons are slightly heavier than the combined mass of an electron and proton carbon 14 has a higher percentage neutrons than carbon 12 so it is heavier relative to the number of particles in it's nucleus(14)
an electron is about 1/1836 amu.
Atomic mass is so small you can't actually measure it. So, just like carbon dating, you have to use a relative mass.
Dunno, but the ratio of the mass of a proton to the mass of what prople think of as being an electron is approx 1980. I'd check that if I were you though. Probably OK to +- 5%.