What is the PROBABLE electronic configuration of a species that underwent reduction? What is the PROBABLE electronic configuration of a species that underwent oxidation?
Upon redox reaction, a particular atom TENDS to assume a Noble Gas configuration.
And of course, this is a gross simplification, and it does not really apply to the transition metals.
For Group 1 and Group 2, these metals tend to be oxidized, and lose 1 or 2 electrons, to assume the electronic configuration of the last Noble Gas. And thus alkali metals and alkaline earth metals tend to assume oxidation numbers of
Non-metals, electron poor species, tend to be REDUCED, and assume the the electronic configuration of the NEXT Noble Gas. And thus