\(\left\{{}\begin{matrix}P=E\\P+N+E=52\\N-P=1\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}2P+N=52\\N-P=1\end{matrix}\right.\\ \Leftrightarrow\left\{{}\begin{matrix}P=E=Z=17\\N=18\end{matrix}\right.\\ \Rightarrow\left\{{}\begin{matrix}A:Clo\left(Z_{Cl}=17\right)\\Cấu.hình:1s^22s^22p^63s^23p^5\end{matrix}\right.\)
⎧⎪⎨⎪⎩P=EP+N+E=52N−P=1⇔{2P+N=52N−P=1⇔{P=E=Z=17N=18⇒{A:Clo(ZCl=17)Cấu.hình:1s22s22p63s23p5