HCI a compound or element?
HCI does not exist. Be careful when reading the formula it is HCl; H for hydrogen and Cl for chlorine (L) HCl is not on the periodic table as it is a compound, not an element. It is called hydrogen chloride. When HCl gas is dissolved in water it is called hydrochloric acid. The two elements that make it up and are on the periodic table are hydrogen (H) and chlorine (Cl).