No, magnesium is its natural state while magnesium oxide is formed magnesium heated in oxygen or air
Oxygen.
positive 2
2Mg + O2 --> MgO Oxygen oxidizes the Mg to Mg2+, which in turn reacts with oxygen to form MgO
No, magnesium oxide is a compound of magnesium and oxygen. It consists of Mg2+ ions and O2- ions. Magnesium is a pure element made of nothing but Mg atoms.