The answer would be:
[tex]SF_{6}[/tex]
If you'd like to know why:
Sulfur is a non-metal and Flourine is a non-metal
Because they are both non-metal, we know that they would be a covalent bond.
In naming covalent bonds, you need to consider the number of atoms of each element in the compound.
Sulfur hexaflouride
Sulfur alone would indicate that there is only 1 atom of sulfur is involved in the compound.
Hexa means 6 so hexaflouride means that there are 6 flourine atoms.
If you put it in a chemical formula, you put the number of atoms as a subscript of in front of each symbol of the atom.
[tex]S_{1}F_{6}[/tex]
Since there is only 1 sulfur, we do not need to put the 1 anymore so you are left with:
[tex]SF_{6}[/tex]
