Ta có: \(\left\{{}\begin{matrix}p+e+n=46\\\dfrac{n}{p+e}=\dfrac{8}{15}\\p=e\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}p=e=15\\n=16\end{matrix}\right.\)
`=> X: Photphorus (P)`
\(\left\{{}\begin{matrix}p+e+n=46\\p=e\\\dfrac{n}{p+e}=\dfrac{8}{15}\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}p=15\\e=15\\n=16\end{matrix}\right.\)
⇒ Nguyên tố cần tìm là Photpho (P).