What is the oxidation state of each element in the species Mn (ClO4) 3

First, we'll calculate the valency of chlorine by using the net charge on the ClO₄ ion.

The ClO₄ ion has a charge of - 1, while each oxygen atom exhibits a charge of - 2. Therefore,

Cl + 4 (-2) = - 1

Cl = 7

Next, the valency of Mn is calculated by using the overall charge, which is 0

Mn + 3 (-1) = 0

Mn = 3

Therefore, the valencies are:

Mn = 3

Cl = 7

O = - 2