What is the name of #Ni(ClO_3)_2#?
You're dealing with an ionic compound, which means that you can break it down into cation, or positively charged ion, and anion, or negatively charged ion.
Right from the start, the
Since nickel is a transition metal that can exhibit multiple oxidation states, you're going to have to use Roman numerals to name this ionic compound.
Now focus on the anion,
This means that the ionic compound will be called - remember that the cation is added first
Here the Roman numeral (II) symbolizes the oxidation state of the transition metal cation.