To determine if the bond in bromine (Br2) is polar or nonpolar, we first need to look at the electronegativity values of the atoms involved. Electronegativity is a measure of how strongly an atom attracts electrons in a chemical bond.
In the case of Br2, both atoms are bromine. Bromine has an electronegativity value of approximately 2.8 on the Pauling scale. Since both atoms in the bond are identical, they have the same electronegativity value.
For a bond to be considered polar, there must be a significant difference in electronegativity between the two atoms. Typically, a difference of 0.4 or more indicates a polar bond. However, since the difference in electronegativity in Br2 is 0 (2.8 – 2.8), the bond is nonpolar.
In summary, the Br2 molecule consists of two identical atoms sharing electrons equally, which means there is no dipole moment. Therefore, we conclude that the bond in bromine (Br2) is nonpolar.