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The electronic configuration for the oxygen atom is [math]1s^2 2s^2 2p^4[/math]. It must acquire 2 electrons to become an ion with a charge of -2 . Thus the electronic configuration for an [math]O^{2 -}[/math] ion is
We represent the arrangement of electrons in an atom (the electron configuration) using an orbital diagram, a picture that shows the arrangement by orbital. A sample orbital diagram for the boron atom is shown below. Boron has five protons and five electrons.2s 2 2p 1). The two electrons in boron's 1s orbital (1s 2) are buried too deep inside the atom to react. You might be wondering at this point how you write an electron configuration-how to determine the order that orbitals fill up in.