* Hydrogen Chloride (HCl): The most common compound of hydrogen and chlorine is hydrogen chloride. It's a gas at room temperature and forms hydrochloric acid when dissolved in water.
* Dichlorine Monoxide (Cl₂O): This compound exists, but it's not called "hydrogen dichloride". It contains two chlorine atoms and one oxygen atom.
The prefixes "di" and "mono" in chemical names indicate the number of atoms of each element in the compound.
Let me know if you have any other chemical formulas you'd like help with!
