A work breakdown structure, or WBS, is a model that can be used for this purpose. In this model you devide the workload in the named phases and appoint the needed area's, tasks and activities under thes phases.
While there are many ways to describe what antioxidants do inside the body, one definition of antioxidants is any substance that inhibits oxidation, especially one used to counteract the deterioration of stored food products or removes potentially damaging oxidizing agents in a living organism.
Oil is a mixture of compounds (2 or more elements bonded together), not an element itself, so it does not appear in the periodic table. Crude oil is a mixture of Hydrogen and Carbon compounds (hydrocarbons) of varying lengths, but with the general formula CnH2n+2, for example octane, C8H18.