Cobalt(VI) chloride doesn't exist in a stable form. Here's why:

* Cobalt's Common Oxidation States: Cobalt typically exists in oxidation states of +2 and +3. These are the most stable states.

* High Oxidation States: Cobalt in a +6 oxidation state is highly unstable due to the large number of electrons that need to be removed from the cobalt atom.

In Summary: While you can theoretically write a chemical formula for Cobalt(VI) chloride (CoCl₆), it's highly unlikely to be found in a stable compound.