Lithium oxide is a chemical compound formed from lithium and oxygen. The chemical formula for lithium oxide is Li2O.
Explanation: Lithium (Li) is an alkali metal that typically forms a +1 charge when it reacts. Oxygen (O), on the other hand, usually forms a -2 charge. To balance these charges and create a neutral compound, two lithium ions are needed for every one oxide ion. Therefore, the formula indicates that two lithium atoms combine with one oxygen atom to form lithium oxide, which is reflected in the formula Li2O.