a,1p=1u, 1n=1u => 26p+30n=56u = 56.1,6605.10^-27= 9,3.10^-26 kg
1e=0,00055u => 26e= 0,0143u=0,0143.1,6605.10^-27= 2,37.10^-29 kg
mFe= 9,3.10^-26+2,37.10^-29=9,3.10^-26 kg
b, me/mFe= 2,37.10^-29/9,3.10^-26= 2,55.10^-4
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