Determine the oxidation states of halogen and phosphorus atoms in the following compounds Cl2, K3PO4, P2O5, FeBr3

The oxidation state of chlorine in Cl2 = 0, because it is a simple substance;
The oxidation state of phosphorus in K3PO4, P2O5 = +5, this is its maximum CO;
The oxidation state of bromine in FeBr3 = -1, because halogens are strong oxidizing agents.



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