Each element has 2 subscripts because they are a diatomic molecule.
Explanation:
Given Equation: [tex]2 H_{2}+O_{2} \rightarrow 2 H_{2} O[/tex]
The meaning of ‘di’ in Greek is two. The diatomic molecules consist of only two atoms. The atmosphere of Earth mostly consists of diatomic molecules. The representation of subscript 2 of hydrogen and oxygen in the equation states that there are 2 hydrogen atoms and 2 oxygen atoms are present in the equation.
