The table above shows the formulae of some ions. In which of these compounds is the formula not correct?
Iron(III)bromide is the correct answer because Fe has a valency of +3 while Br has a valency of -1,
In the bid to form compounds, they bond together and exchange their valency.
⇒ Fe takes the valency of Br which is 1 while Br takes the valency of Fe which is 3.
Therefore, the formula for the compound formed should be FeBr3 and not Fe3Br
