Oxidation Number Calculator

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Oxidation and reduction process happens in every chemical reaction and during this process, there is a

transfer of electrons and based on this transfer oxidation number of an element or a compound is evaluated.

Oxidation number calculator is the online tool which can calculate oxidation numbers of an element or a

compound.

Example 1: Calculate the oxidation number of every element of the compound magnesium

chloride.

Given: Magnesium chloride MgCl2

In the periodic table, Chlorine ‘Cl’ comes under Halogen group and the oxidation number of every element in

that group is ‘-1’, because of their valence electrons.

Hence oxidation number of ‘Cl’ is -1.

Let magnesium oxidation number= x

Now since the overall charge or oxidation number on the compound = 0

Hence we get x + (2*-1) = 0-> x -2= 0 ->  x = +2

Hence oxidation number of Magnesium is +2

Example 2: Calculate the oxidation number of every element of the compound Fe2O3.

Given: Iron(III) oxide-> Fe2O3.

In the periodic table, Oxygen ‘O’ usually has the oxidation number= ‘-2’ (excluding some exceptions) because

of its valence electronic configuration.

Hence oxidation number of ‘O’ is -2.

Let Iron, Fe oxidation number= x

Now since the overall charge or oxidation number on the compound = 0

Hence we get 2x + (3*-2) = 0-> 2x -6= 0 -> 2x = 6->  x= +3

Hence oxidation number of Iron, Fe is +3.