Not enough information is given. Sulfur and iodine are both non-metals and can potentially bond in more than one ratio, so you need some prefixes to accurately name these covalently bonded compounds. (see covalent bond nomenclature.)
Formula: NI3
The chemical formula for antimony iodide is SbI3.
The chemical formula for uranium(VI) iodide is UI6.
Formula: NaI
The chemical formula for chromium(III) iodide is CrI3.
Formula: NI3
The chemical formula for ammonium iodide is NH4I.
The chemical formula for antimony iodide is SbI3.
The chemical formula for monatomic iodide is I-.
The chemical formula for uranium(VI) iodide is UI6.
Formula: I-
Formula: I-
Formula: NaI
The chemical formula of aluminium iodide is AlI3.
The chemical formula for chromium(III) iodide is CrI3.
The chemical formula for potassium iodide is KI. It consists of one potassium atom (K) and one iodide atom (I).
== Potassium (K) and iodine (I) combine in a one-to-one ratio to form potassium iodide, which has KI as its chemical or molecular formula. A link can be found below for more information.