The binary nonmetal compound N2O4 is commonly known as dinitrogen tetroxide.
Dinitrogen tetroxide is composed of two nitrogen atoms and four oxygen atoms. In naming binary compounds, the prefixes are used to indicate the number of atoms of each element present in the molecule. Here, ‘di-‘ refers to the two nitrogen atoms, and ‘tetra-‘ indicates the four oxygen atoms. This systematic naming helps distinguish it from other nitrogen oxide compounds that may have different properties and structures.