* Bromine's Electron Configuration: A bromine atom has 35 electrons, with the following electron configuration: [Ar] 3d¹⁰ 4s² 4p⁵. This means it has 7 valence electrons (in the 4s and 4p orbitals).
* Bond Formation: When two bromine atoms form a bond, they share one electron each, creating a single covalent bond. This leaves three lone pairs of electrons on each bromine atom.
* Total Unshared Pairs: Therefore, a bromine molecule (Br₂) has a total of six unshared pairs of electrons (three on each bromine atom).
Important Note: It's easy to get confused about the number of unshared pairs. Remember to consider the number of valence electrons and how many are involved in the bond.
