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PI5
PI5
Phosphorous Pentaiodide
Pi to the 5th power is approximately 306.019684785
Theoretically PI5 should be formed as PCl5 but practically. due to large atomic size 5 iodine atoms can not attached directly with one phosphorus atom
The imaginary compound nitrogen pentaiodide would be NI5 , it would not be an acid- there are no ionisable H atoms. (or a Lewis acid- it has no lone pair.) There is a real compound NI3, a very unstable substance a contact explosive. There is a reported PI5, but that is disputed.
Because around the quite small P atom (Five 3s2, 3p3 valence electrons in five new "s2p3"-hybrid orbitals in a trigonal bipyramidal shape) there is not enough space to be surrounded by five (5) quite big Iodine atoms (Seven 5s2, 5p5 valence electrons)
Don't know P2I5. PI5 (phosphorus pentaiodide) is more likely but couldn't find anything on that. Maybe this is meant: P2I4 , diphosphorus tetraiodide synthesized from phosphorus triiodide 2 PI3 → P2I4 + I2