Question

The formula of a compound between any group $13$ element, $M$, and any group $16$ element, $X$ will be:

• A. $M{X}_2$
• B. $M_{2}X$
• C. $M_3{X}_2$
• D. $M_2{X}_3$

Answer 1

The correct option is D $M_2{X}_3$

The formula of a compound between any group $13$ element, $M$, and any group $16$ element, $X$, will be $M_2{X}_3$. An example is aluminum oxide $A{l}_2{O}_3.$ $M$ will lose three electrons to complete its octet. It will form $M^{3+}$ ion. $X$ will gain two electrons to complete its octet. It will form $X^{2-}$ ion. Two $M^{3+}$ ions will combine with three $X^{2-}$ ions.