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Electron Configuration Of Oxygen 2-. Electron configuration of oxygen is [he] 2s2 2p4. For o2−, which is the same electron configuration as ne.
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Argon has the electron configuration of 1s 2 2s 2 2p 6 3s 2 3p 6, so for zinc, it's ok to write [ar]4s 2 3d 10. So,this two extra electrons will be attached the last shell's orbital (2p). The charge of oxide ion is —2, which means an oxygen atom gained 2 extra electrons.
Just replace this portion of zinc's electron notation with argon's chemical symbol in brackets ([ar].) so, zinc's electron configuration written in shorthand is [ar]4s 2 3d 10.
Electron configuration of oxygen is [he] 2s2 2p4. I assume that you already know how to draw a molecular orbital digram like the one below. Both of the configurations have the correct numbers of electrons in each orbital, it is just a matter of how the electronic configuration notation. As you can see it gets a bit long.
