Ta lập HPT: \(\left\{{}\begin{matrix}2Z+N=180\\2Z=1,432\cdot N\end{matrix}\right.\) \(\Leftrightarrow\left\{{}\begin{matrix}Z=53=p=e\\N=74\end{matrix}\right.\)
\(\left\{{}\begin{matrix}P+N+E=180\\P=E\\P+E=1,432N\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}2P+N=180\\2P-1,432N=0\end{matrix}\right.\\ \Leftrightarrow\left\{{}\begin{matrix}P=E=Z=53\\N=74\end{matrix}\right.\)