Oxidation Number and Nomenclature

Oxidation Number and Nomenclature

(i) When an element forms two monoatomic cations (representing different oxidation states), the two ions are distinguished by using the ending-ous and ic. The suffix – ous is used for the cation with lower oxidation state and the suffix – ic is used for the 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, Roman numeral written in parentheses immediately after the name of the element indicates the oxidation states. For example,

 

Cu2O

Copper (I) oxide

SnO        

Tin (II) oxide

FeCl2

Iron (II) chloride

Mn2O7     

Manganess (VII) oxide

K2Cr2O7  

Potassium dichromate (VI)

Na2CrO4

Sodium chromate (VI)

V2O5

Vanadium (V) oxide

CuO

Copper (II) oxide

SnO2

Tin (IV) oxide

FeCl3

Iron (III) chloride

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