The oxygen ion O²²⁺ has a charge of +2, indicating that it has lost two electrons compared to the neutral oxygen atom.
The atomic number of oxygen is 8, and its neutral electronic configuration is 1s² 2s² 2p⁴, with six valence electrons (2s² 2p⁴).
When oxygen loses two electrons to form the O²²⁺ ion, its electronic configuration becomes 1s² 2s² 2p².
In the O²²⁺ ion, there are only two valence electrons remaining in the 2s and 2p orbitals.