The subscript for nitrogen in hydrazine, N2H4 is 2.
In chemistry, when writing the chemical formula of chemical compounds, subscripts refers to the numerical numbers that are sometimes put at the base of some chemical symbols. The subscripts are used to indicate the number of atoms that are present in each element. For example, in hydrazine, the subscript 2 indicates that two atoms of nitrogen are present, while the subscript 4 indicates that four atoms of hydrogen are presents.
