$m_{nguyên\ tử} = 6.1,67.10^{-27} + 6.1,67.10^{-27} + 6.9,1.10^{-31} = 2.10^{-26}(kg)$
\(\%m_e=\dfrac{6.9,1.10^{-31}}{2.10^{-26}}.100\%=0,027\%\%\)
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