Question

Magnesium reacts with an element $(X)$ to form an ionic compound. If the ground state electronic configuration of $( X )$ is $1 s ^{2} 2 s ^{2} 2 p ^{3}$, the simplest formula for this compound is

• A. $Mg_3X_2$
• B. $Mg_2X_3$
• C. $Mg_2X$
• D. $MgX_2$

Answer 1

Answer: (A)

$Mg_3X_2$

Answer 2

Element $(X)$ electronic configuration $1 s^{2} \,2 s^{2} \,2 p^{3}$ So, valency of $X$ will be $3$ . Valency of $Mg$ is $2$ . Formula of compound formed by $Mg$ and $X$ will be $Mg _{3} X _{2}$