* Oxygen's Electronic Configuration: Oxygen has six electrons in its outer shell (valence shell). It needs two more electrons to achieve a stable octet (eight electrons).

* Sharing Electrons: To achieve this stability, two oxygen atoms share two pairs of electrons, forming a double covalent bond. This sharing allows each oxygen atom to have eight electrons in its outer shell.

Representation:

The double covalent bond between two oxygen atoms is often represented by the following:

O=O

This notation shows that two pairs of electrons are being shared between the two oxygen atoms.