Question

The formula of a compound between any group $2$ element, $M$, and any group $17$ element, $X$, will be:

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

Answer 1

The correct option is C $M{X}_2$

The formula of a compound between any group $2$ element, $M$, and any group $17$ element, $X$, will be $M{X}_2$. An example is calcium chloride $CaC{l}_2.$ $M$ will lose two electrons to complete its octet. It will form $M^{2+}$ ion. $X$ will gain one electron to complete its octet. It will form $X^{-}$ ion. One $M^{2+}$ ion will combine with two $X^{-}$ ions.