The picture that represents the Lewis structure of magnesium is Mg. Mg . Option B
In a Lewis structure, magnesium (Mg) typically forms an ionic bond, losing its two valence electrons to achieve a stable octet configuration. The Lewis dot structure for magnesium, therefore, shows the symbol "Mg" surrounded by two dots, each representing one valence electron, denoting the loss of those electrons.
Out of the options provided, the representation that best fits the Lewis structure of magnesium is Mg • Mg.
This notation indicates the transfer of two valence electrons from the magnesium atom (Mg) to another entity, as magnesium typically loses two electrons to form a stable 2+ cation in its compounds.