You're right to be curious! Oxygen is actually a polar molecule, even though it consists of just two identical oxygen atoms. Here's why:

* Electronegativity: Oxygen is a highly electronegative atom, meaning it has a strong attraction for electrons. In an oxygen molecule (O2), both oxygen atoms have the same electronegativity.

* Equal Sharing: Since the two oxygen atoms are identical, they share the electrons in the double bond equally.

* No Net Dipole Moment: While each oxygen atom does have a slight negative charge due to the electron sharing, these charges are equal and opposite. They cancel each other out, resulting in no net dipole moment for the entire molecule.

So, while oxygen is a diatomic molecule with individual polar bonds, the symmetrical distribution of charge makes the molecule itself nonpolar.

Let me know if you have any more questions about polarity!