Magnesium is in group 2 of the Periodic table and is not a stable cation.
To make a strong and stable form of Magnesium it has to lose 2 electrons to form a stable 2- Ion--- But How?
|A) The electrons are shown as dots and crosses. (Picture 1)|
|B) Oxygen is in group 16 of the Periodic table. An oxygen atom will gain 2 electrons to form a stable 2- Ion. The only way to make Strong Ionic Bond.|