What we found is that SF7 is 'sulfur heptafluoride'. However, the highest fluoride of sulfur is sulfur hexafluoride SF6.
Sulfur Fluoride is any of a group of compounds of sulfur with fluorine that includes SF6 (sulfur hexafluoride), SF4 (Sulfur tetrafluoride), S2 F10 (Disulfur decafluoride), SF2 (Sulfur Difluoride), and S2 F2 (Sulfur fluoride). Only the first three compounds have practical importance.
Heptafluoride typically refers to compounds with the formula RnMxF7y− or RnMxF7y+, where n, x, and y are independent variables and R any substituent.
The only binary heptafluorides are iodine heptafluoride (IF7), rhenium heptafluoride (ReF7), and gold heptafluoride (AuF7). Only IF7 and ReF7 are true heptafluorides, however, as AuF7 is actually a coordination complex of gold pentafluoride (AuF5) and molecular fluorine; therefore, the correct chemical formula of gold heptafluoride is actually AuF5•F2.
Studying chemistry can be stressful and feel overwhelming. There is no magic formula for learning chemistry, but you can develop an effective strategy for success. Check out some tips that will help you get on the right track at About.com.