TRANSITION metal.The most common OXIDATION states of chromium are +6, +3, and +2.A few stable compounds of the +5, +4, and +1 states, however, are KNOWN.Out of them, +3 is the most stable oxidation state for chromium. Oxidation stateIt is ALSO known as an oxidation number.It is a number assigned to an element in a chemical combination which represents the number of electrons lost, by an atom of that element in the compound.If the number is negative it represents the number of electrons GAINED by the element.