The little number after an element is called the Subscript and it shows how many atoms of the element are present.
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A subscript is a small number that seems to the right of an element's symbol. That number represents the number of atoms of that element in the compound.
A chemical equation, an expression that gives the identities and quantities of the substances involved in a reaction, describes a chemical reaction.
A subscript is the small number that seems to the right of an element's symbol. That number represents the number of atoms of that element in the compound.
Subscripts tell about the number of atoms of a particular element.
Thus, the answer is subscript.
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