Final answer:
The Lewis structure for the compound formed by Mg and O is represented by Mg2+ [:O:]2- or MgO, signifying an ionic bond between magnesium cation and oxygen anion to form magnesium oxide.
Step-by-step explanation:
To draw the Lewis structure for the compound resulting from Mg and O, we must first recognize that these elements form an ionic compound, magnesium oxide (MgO). In this process, magnesium (Mg) donates two electrons to become Mg2+, and oxygen (O) accepts two electrons to become O2-.
The Lewis symbol for magnesium would be [Mg]2+ and for oxygen [O]2- with a full set of eight valence electrons, which can be represented as [:O:]2-.
When predicting the final compound formed by Mg and O, we consider that Mg has the configuration of [Ne] and oxygen has the configuration of [He]2s22p4.
Magnesium wants to lose two electrons to reach the stable electron configuration of neon, while oxygen wants to gain two electrons to reach the stable electron configuration of neon. They achieve this through an ionic bond, resulting in Mg2+ and O2- ions.
The final Lewis structure for magnesium oxide will show Mg2+ and O2- ionic bond formed by the attraction between the oppositely charged ions:
Mg2+ [:O:]2- or simply as MgO in its ionic form.