* Electronegativity: Chlorine atoms have the same electronegativity. Electronegativity is the ability of an atom to attract electrons in a bond.
* Equal Sharing: Since both chlorine atoms have the same electronegativity, they share the electrons in the bond equally. There is no partial positive or partial negative charge on either atom.
* No Dipole Moment: Because there's no uneven distribution of charge, the molecule has no overall dipole moment.
In summary: The Cl₂ molecule is nonpolar due to the equal sharing of electrons between identical chlorine atoms.