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Periodic Trends

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


Electronic configuration of X is 1s2,2s2,2p3. It is a 15th group requires three electrons to attain octet. So, valency of X will be 3 . 

Magnesium ion =Mg2+

Formula : Mg3X2

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