Question

The formula of a compound between any group $2$ element, $M$, and any group $15$ element, $X$, will be:

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

Answer 1

The correct option is A $M_3{X}_2$

The formula of a compound between any group $2$ element, $M$, and any group $15$ element, $X$, will be $M_3{X}_2$. An example is calcium nitride $C{a}_3{N}_2.$ $M$ will lose two electrons to complete its octet. It will form $M^{2+}$ ion. $X$ will gain three electrons to complete its octet. It will form $X^{3-}$ ion. Three $M^{2+}$ ions will combine with two $X^{3-}$ ion.