The chemical formula is PI3.
The chemical formula of nitrogen triiodide is NI3.
The chemical symbol (not formula) of phosphorous is P; the chemical symbol (not formula) of chlorine is Cl.
The chemical formula FeI3 is for iron triiodide.
nitrogen triiodide
The chemical formula for nitrogen triiodide is NI3. It contains:1 Nitrogen atom3 Iodine atomsIn brief, nitrogen triiodide is purple in colour and extremely reactive.
PCl3 is the chemical formula for phosphorous trichloride.
Br is the chemical symbol for Bromine. There are three fluorine atoms covalently bonded, so they form triflouride. The full name is then bromine fluoride.
It would be phosphorus (I) iodide. However, this is not a stable compound; under normal conditions phosphorus and iodine combine to produce phosphorus (III) iodide (which is also not stable ... it's explosive ... but is considerably more stable than phosphorus (I) iodide is). The electron configuration of the phosphorus in PI3 is [Ne]s2, while that of PI is [Ne]s2p2. The filled s subshell is at least metastable, while a filled s subshell plus a partially filled p subshell is normally not and requires considerable effort to maintain.
Phosphorous belong to group 15 of the periodic table.
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