How can an oxidation number be determined?
Oxidation state/number is the charge left on the central atom, when all the bonding pairs of electrons are broken with the charge assigned to the more electronegative atom.
Redox chemistry is conceived to occur on the basis of addition OR subtraction of electrons. Typically, an element in a compound or complex (or the element itself) is assigned an oxidation number. The sum of the oxidation numbers always equals the charge on the ion.
I will consider a few simple examples:
TO begin, elemental oxygen,
And likewise for