* Diatomic molecules: Bromine exists as a molecule with two bromine atoms bonded together (Br-Br).

* Identical electronegativity: Both bromine atoms have the same electronegativity. Electronegativity is the ability of an atom to attract electrons in a bond. Since they are the same, there's no uneven sharing of electrons.

* No dipole moment: Because the electrons are shared equally, there is no separation of charge within the molecule. This means there is no dipole moment, which is a measure of the separation of positive and negative charges.

Therefore, bromine (Br₂) is nonpolar.