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 1s22s22p3, the simplest formula for this compound is

Easy
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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