Question

why an atom has differen oxidation number like oxygen has oxidation number like -2,-1 ,-1/2​

Answer 1

Answer:

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Oxidation states, (aka oxidation numbers), are numbers that show how many electrons the element would lose or gain if it were to bond to other atoms. For example, iron can have an oxidation state of +3. This means that iron has lost three electrons. Oxygen (which isn't a transition metal) has an oxidation state of -2. This means it would gain 2 electrons. You see, some atoms like to give away their electrons and some like to take them.

An oxidation state shows how many electrons an atom would gain or lose if it were to bond with other atoms. Transition metals can have multiple oxidation states because of their electrons. ... When they attach to other atoms, some of their electrons change energy levels.

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