What is the oxidation number of Ba in BaFeO₄?

Question

Quizplus · Accepted Answer

The oxidation number of Fe is +2 and the sum of the oxidation numbers in the molecule should equal 0. Oxygen has an oxidation number of -2 and S has an oxidation number of -2. Therefore, (1 x O) + (1 x S) = -2. This means that the oxidation number of Ba can be calculated as follows: 
(+2 for Fe) + (1 x O) + (1 x S) + (x for Ba) = 0 
Solving for x gives x = +2, so Ba has an oxidation number of +2 in this molecule.

What Is the Oxidation Number of Ba in BaFeO4

What Is the Oxidation Number of Ba in BaFeO₄