#P-4S_6#= tetra phosphate hexasulfide. or Phosphate +3 sulfide.
# SF_6. Sulfur hexaflouride. or Sulfur+6 flouride
There are two acceptable ways of naming these compounds.
(a) Using multiplying prefixes
mono = 1, but the prefix is omitted before the name of the first element
tetra = 4
penta = 5
hexa = 6
(b) Using Roman numerals to indicate oxidation numbers
When an element can have more than one oxidation number, the oxidation number is indicated by a Roman numeral in parentheses immediately following the name (no spaces) of the element.