* Symmetry: The molecule is perfectly symmetrical. The two oxygen atoms pull on the electrons in the bonds equally and in opposite directions.
* Electronegativity: Oxygen is more electronegative than carbon. This means oxygen attracts the shared electrons in the bonds more strongly, creating a partial negative charge (δ-) on each oxygen atom and a partial positive charge (δ+) on the carbon atom.
* Cancellation of Dipole Moments: Even though each C-O bond is polar (due to the electronegativity difference), the symmetrical arrangement of the molecule causes these dipoles to cancel each other out.
Think of it like this: Imagine two tug-of-war teams pulling with equal strength in opposite directions. The rope doesn't move because the forces balance. Similarly, the dipole moments in CO₂ cancel each other out, resulting in a non-polar molecule.
