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Oxidation
It is oxidation because two O's 1 x 1 d 2 i's 1 n and 1 a
Answer: a + 2
Explanation: Alkali Earths or Group II has an ionization charge of a + 2. Alkali Metals have a ionization a + 1. Halogens or cold elements have a ionization of a +3.
There is no path of electrons around the nucleus. There are however things called orbitals where you are likely to find electrons.