Question

the change in oxidation number from bromime to bromate ion is?

Answer 1

The compound has an overall oxidation number of 0.

O, oxygen as an oxide ion has a oxidation state of -2

So let x be Br,

x + 3 (-2) = 0

x - 6 = 0

x = +6

So Br oxidation number is +6

Also do note that stoichiometric coefficients don’t matter while calculating the oxidation states.

I hope this will help you