diphosphorus tetraiodide is the name of the p2I4 compound.
The name of p2I4 is diphosphorus tetraiodide because there are two atoms with phosphorus and four atoms with iodine. We know that 'di' word is used for two while on the other hand, tetra word is used for four.
So we can conclude that diphosphorus tetraiodide is the name of the p2I4 compound.
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