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Magnesium oxide is an electrical insulator.
All metals are electrically conductive.
Magnesium oxide is formed when magnesium metal reacts with oxygen. It is an oxide of magnesium. Magnesium is the metal, and magnesium oxide is the resulting compound formed when magnesium reacts with oxygen.
Iron and magnesium oxide can react chemically to form iron(II) oxide and magnesium metal. The reaction occurs when iron is heated with magnesium oxide in a high temperature environment, leading to the transfer of oxygen from magnesium oxide to iron.
The white powder left behind when you burn magnesium is called magnesium oxide.