how do i name this chemical?

S(ClO3)2

Sulfur chlorate I suppose

Frankly, I've never seen this before but if I had to name it I would write

sulfur(II) chlorate
Sulfur has common valencies of -2, 0, +4 and +6; the (II) is to denote a valence (oxidation state) of +2.

To name the chemical S(ClO3)2, you'll need to use the rules of chemical nomenclature. Here's how you can do it:

1. Determine the name of the central element: The central element in this chemical is sulfur (S).

2. Determine the charge of the central element: The central element, sulfur (S), has a charge of 0 since it is not specified.

3. Determine the name of the polyatomic ion: In this case, the polyatomic ion is chlorate (ClO3). The root of the polyatomic ion's name is "chlor" since it represents chlorine.

4. Determine the charge of the polyatomic ion: To find the charge of chlorate (ClO3), we need to know that oxygen (O) has a charge of -2. Since there are three oxygen atoms in chlorate (ClO3), the total charge of the ion is -6.

5. Determine the number of polyatomic ions present: The subscript 2 indicates that there are two chlorate (ClO3) ions.

Putting all of this together, we can name the chemical S(ClO3)2 as sulfur dichlorate.