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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
two oxygen atoms are present in oxygen molecule.it forms it molecule by covalent bonding that is sharing two valence electron from each atom to achieve stable octet arrangement.electron arrangement before the bonding is 2.6, after the bonding 2.8. conan edogawa Â· 1 decade ago. 1. Thumbs up.