What is the chemical formula for tetraiodine heptafluoride?

Tetra iodine nonoxide (I₄O₉) IF₇

Explanation:

Tetraiodine nonoxide (I4O9) was formulated but not thoroughly researched for the gas-phase combination of I2 with O3. The chemical substance is iodine pentoxide with either the equation I2O5. The anhydride of iodic acids and the only secure oxide of iodine however is iodine oxide.

the density(ratio between mass and volume as m/v) decreases from top to bottom in periodic table group as the size increases and nuclear charge decreases. but in periods density increases from left to right as atom size decreases and nuclear charge increases.