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A '''transition element''' is a [[chemical element]] whose [[atomic electron configuration]] of the ground (lowest energy) state has an incompletely filled ''d'' sub- <h4>II. [[Atomic electron configuration|Electron Configurations]]</h4>

...a central role in oxidative stress. It has 8 protons and 8 electrons. An [[Atomic electron configuration|electron configuration table]] for the oxygen atoms reads as follows:

:''See [[Atomic electron configuration]] for the orbital occupancies of atoms in their [[ground state]].''