First slide

Periodic Trends

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

Easy

A

${Mg}_{2} X_{3}$
B

${MgX}_{2}$
C

${Mg}_{2} X$
D

${Mg}_{3} X_{2}$

Solution

Electronic configuration of X is $1 s^{2}, 2 s^{2}, 2 p^{3} .$ It is a 15th group element.it requires three electrons to attain octet. So, valency of X will be 3 .
Magnesium ion $= {Mg}^{2 +}$
Formula : ${Mg}_{3} X_{2}$

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