The correct answer is Coefficient.
In a chemical equation, the coefficient indicates the number of molecules of a compound or the number of atoms of an element. For example, in the chemical formula \(2H_2O\), the coefficient "2" indicates that there are two molecules of water.
The subscript refers to the number of atoms of an element in a molecule (for example, in \(H_2O\), the subscript "2" indicates that there are two hydrogen atoms), but it does not indicate the number of molecules.
The chemical symbol represents a single element (like H for hydrogen, O for oxygen) and does not provide quantity information.
Capitals typically refer to the capitalization of the first letter in chemical symbols to distinguish between different elements but do not provide any information about the number of molecules or atoms.