Question

The formula of a compound between a group $13$ element, $M$, and a group $15$ element, $X$, will be:

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

Answer 1

Answer: (A)

$MX$

The formula of a compound between any group $13$ element, $M$, and any group $15$ element, $X$, will be $MX$. An example is aluminum nitride $AlN.$ $M$ will lose three electrons to complete its octet. It will form $M^{3+}$ ion. $X$ will gain three electrons to complete its octet. It will form $X^{3-}$ ion. One $M^{3+}$ ion will combine with one $X^{3-}$ ion.