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Mg²⁺ is the magnesium cation and O^2- is the oxide anion. Mg has two electrons in its valence shell, which it loses to achieve a noble gas configuration while oxygen has 6 electrons in its valence shell, 2 short of achieving a noble gas configuration. Thus the two electrons lost by Mg are gained by oxygen, leading to the formation of MgO.

The formation of Na₂O can be shown with the help of Lewis dot structure.

Na⁺ is the sodium cation and O^2- is the oxide anion. Na has one electron in its valence shell, which it loses to achieve a noble gas configuration while oxygen has 6 electrons in its valence shell, 2 short of achieving a noble gas configuration. Thus the two electrons lost by two sodium atom are gained by oxygen, leading to the formation of Na₂O.

.Ions present sodium ion ,magnesium ion and oxide.