Why are oxygen and hydrogen are diatomic?

Oxygen generally exists as a diatomic molecule in the atmosphere when it is not combined with any other element. It forms the molecule O2 because, in that configuration, it has its lowest energy level when uncombined. These atoms will always be paired together because they need to pool resources to have enough electrons. when two volumes of hydrogen gas and one volume of oxygen gas combine, two volumes of water gas are formed. If hydrogen and oxygen were monatomic (as shown in the equation above), then only one volume of water would be formed. The only explanation is that hydrogen and oxygen are diatomic:

2H2 + O2 → 2H2O

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