What are the oxidation number of the underline elements in each of the following and how do your rationalise your results
`underline (KI_(3))`

Explanation

The chemical structure of `KI_(3) is K^(+) [I-IleftarrowI]`
in `KI_(3),I^(-)` ion forms a coordinate bond with `I_(2)`.The oxidation number of each 1 atom in `I_(2)` molecule is zero and the oxidation number `K^(+)` is +1. Therefore the oxidation number of one `I^(-)`will be -1.