i need to write to chemical formula for sulphur(II)iodide

but both are non metals what do i do
and i get confused sometimes cause i don't know when the metal/non metal gets a one charge (for the valences)
ex. NiO
=Ni1O2
=Ni2O
=Nickel(I)Oxide
ex.
NiF2
=Ni1F2
=Ni2F
=Nickel(II)Fluoride
(i don't know if that is correct or not so can you tell me if the valences are right or not and can you tell me how i get the valences for that specific element cause i don't understand where the valences are when it is one of the transition elements)

PLZ ANSWER ASAP cause i really need help for it :) :)

2 answers

If you are given a name that has a metal with a multivalent possibility, the Roman numerals will tell you which to use. For nickel(I) oxide, that tells you Ni is I (i.e., +1) and not II (i.e., +2. the other common valence). Oxygen usually is -2 so you write Ni2O. For nickel(II) fluoride, that tells you to use Ni as +2 and the formula obviously is NiF2.

So for sulfur(II) iodide you would write
SI2. Sulfur(VI) fluoride would be SF6 (and that often is called sulfur hexafluoride). Post again if this isn't clear. Thanks for making your question very clear by using examples of what is troubling you.
so for all the chemical formulas if there is no subscript (for the valency of the element) does it mean it is a one or do i have to find the valency on the periodic table of elements?
ex. P02
the P for Phosphorus doesn't have a number does it mean it is a one then
ex.SO3
ex.FeCl3
ex.SnCl2
ex.Cu2O
ex.NiBr2
and can you check my answers for and can you tell me which ones are wrong and to correct it...
SnCl2 = Tin(II)Chloride

Cu2O = Copper(I)Oxide

NiBr2 = Nickel(II)Bromide

FeO = Iron(II) Oxide

SbBr5 = Antimony(V)Bromide

CoO = Cobalt(II)Oxide

MnF2 = Manganese(II)Fluoride

SnO2 = Tin(II)Oxide

SO2 = Tin(I)Oxide

BrF7 = Bromine(VI)Fluoride

1. Cobalt(II)Chloride = Co2Cl = CoCl2

2. Sulphur(II)Iodide = S2I1 = SI2

3. Iron(III)Chloride = Fe3Cl1= FeCl3

4. Antimony(V)Sulphide = Sb5S2 = Sb2S5

5. Lead(II)Nitride = Pb2N3 = Pb3N2

6. Tin(II)Fluoride = Sn2F1 = SnF2

7. Copper(II)Oxide = Cu2O2 = CuO

8. Tin(IV)Chloride = Sn4Cl1= SnCl4

9. Mercury(I)Phospide = Hg1P3 = Hg3P

i know that it is a lot of questions but i only put that many is because i am scared that i wont understand with only 1 or 2 examples if and when i am wrong so plz check and answer ASAP cause i need help for it
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