mp=1,6726.10-27(kg)
me=9,1094.10-31(kg)
mn=1,6749.10-27(kg)
mnguyên tử cacbon= 6.mp + 6.mn + 6.me= 6.1,6726.10-27 + 6.1,6749.10-27 + 6.9,1094.10-31= 2,009.10-26 (kg)
\(\dfrac{m_{e\left(Cacbon\right)}}{m_{nt\left(Cacbon\right)}}=\dfrac{6.\left(9,1094.10^{-31}\right)}{2,009.10^{-26}}=2,7206.10^{-4}\)
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