Oxidation number and Nomenclature

(i) When an element forms two monoatomic cations (representing distinct oxidation states), the two ions are distinguished by using the ending-ous and ic. The suffix - ous is used for cation with lower oxidation state and the suffix - ic is used for cation with higher oxidation state.

For example : Cu⁺ (oxidation number +1) cuprous

                      Cu²⁺ (oxidation number +2) cupric

         (ii) Albert Stock proposed a new system known as Stock system. In this system, the Roman numeral written in the parentheses immediately after the name of the element indicates the oxidation states.

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