Taking into account the definition of oxidation number, the oxidation numbers for bromine in the molecule H₂Br₂O₆ is +5.
The oxidation number is the charge that an atom has; is an integer that represents the number of electrons an atom puts into play when it forms a given compound.
In other words, the oxidation number of an element is a value that indicates the number of electrons that element gains or loses when it combines with another.
To determine the oxidation state of different elements it is necessary to know that:
On the other side, the sum of the oxidation numbers of the existing elements in a chemical formula must add up to zero.
Then, considering the oxidation numbers of each element, multiplying it by the number of existing elements in the chemical formula and adding it and equaling it to zero, the value of the missing oxidation number can be obtained.
In this case, the oxidation numbers of bromine is calculated as:
H₂Br₂O₆: 2× (+1) + 2× (oxidation numbers of nitrogen) + 6×(-2)= 0
2 + 2× (oxidation numbers of nitrogen) - 12= 0
2× (oxidation numbers of nitrogen) - 10= 0
2× (oxidation numbers of nitrogen) =10
oxidation numbers of nitrogen= 10÷2
oxidation numbers of nitrogen= +5
Finally, the oxidation numbers for bromine in the molecule H₂Br₂O₆ is +5.
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