The oxidation number of oxygen (Group VI, period 2) is -2.
- The electrical charge of an atom describes its Oxidation number.\
- The number of electrons that must be gained or lost in an atom's valence electron shell to make it to be filled or half-filled gives us the oxidation number value.
- When the atom gains electrons,it acquires a negative oxidation number. When the atom loses electrons,it acquires a positive oxidation number
- Oxygen has 8 electrons with {He] 2s² 2p⁴ configuration.
- With 6 electrons in its valence shell, it need to gain 2 electrons to achieve stability, When it gains 2 electrons, it acquires a negative oxidation number of -2.
See more here:https://brainly.com/question/11621135
