The bond between oxygen atoms in the gas phase is a double covalent bond.

Here's why:

* Oxygen is diatomic: Oxygen exists naturally as a molecule with two oxygen atoms bonded together (O₂).

* Covalent bonding: Oxygen atoms share electrons to achieve a stable configuration. In this case, each oxygen atom contributes two electrons to form a shared pair, resulting in a double bond.

Let me know if you'd like more details on covalent bonding!