\(M=23\Rightarrow A=23\Leftrightarrow P+N=23\Leftrightarrow N=23-11=12\)
\(P=E=11\)
\(m_p=11.1,6726.10^{-27}=1,83986.10^{-26}\left(kg\right)\)
\(m_n=12.1,6748.10^{-27}=2,00976.10^{-26}\left(kg\right)\)
\(m_e=11.9,1094.10^{-31}=1,002034.10^{-29}\left(kg\right)\)
p=e=11
Có m(p)=1 đvC
=>m(p) (Na) = 11 đvC
m(e)=0,00055 đvC
=> m(e) (Na) = 11.0,00055=0,00605 đvC
m(n) (Na) =23-11-0,00605 ≈ 12 đvC