The diagram which shows the correct way to represent the ionic compound, magnesium oxide is option D.
Electron dot structure is a representation of the valence electrons of an element, represented by the dots around the symbol of the element.
An ionic compound is formed by the combination of two or more ions. Note that the two ions that compose an ionic bond are held purely by electrostatic interaction of the oppositely charged ions.
The correct depiction of MgO is the arrangement in which the two ions, [tex]Mg^{2+}[/tex] and [tex]O^{2-}[/tex] are placed in different brackets and the oxygen ion has a complete octet as seen in option D.
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