Ta có: \(\frac{1}{4}NTK_X=\frac{1}{3}NTK_K\)
\(\Leftrightarrow\frac{1}{4}NTK_X=\frac{1}{3}\times39\)
\(\Leftrightarrow\frac{1}{4}NTK_X=13\)
\(\Leftrightarrow NTK_X=13\div\frac{1}{4}=52\left(đvC\right)\)
Vậy X là crôm Cr
Theo đề bài ta có:
\(\frac{1}{4}.M_X=\frac{1}{3}.M_K\Leftrightarrow M_X=\frac{1}{3}.39:\frac{1}{4}=52\)
\(X:Crom\left(Cr\right)\)