Q.

Magnesium reacts with an element (X) to form an ionic compound. If the ground state electronic configuration of (X) is 1s22s22p3, the simplest formula for this compound is

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a

Mg2X3

b

MgX2

c

Mg2X

d

Mg3X2

answer is D.

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Detailed Solution

Electronic configuration of X is 1s2,2s2,2p3. It is a 15th group element.it requires three electrons to attain octet. So, valency of X will be 3 . Magnesium ion =Mg2+Formula : Mg3X2
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