what noble gas electron configuration is achieved by the bromine atoms in a molecule of BR2, a diatomic element?

answer: Krypton

Explanation:

In bromine molecule bromine atom achieved Krypton electron configuration because before forming bromine molecule it had only 35 electron but after formaion molecule one elctron is shared by other bromine atom and after that bromine has 36 elecron which resembles with Krypton atomic number hence electronic configuration also achieved is same as Krypton.