The image which represents a stable molecule of bromine, Br2 is; Choice B: Diagram B.
As implied in the question;
- Like Flourine, one bromine atom can form a diatomic covalent molecule with another bromine atom.
- A covalent bond is a bond characterized by the sharing of electrons as opposed to the complete transfer of electrons in ionic bonding.
Since each Bromine atom has 7 Valence electrons, they both donate an electron to form an electron pair which they both share.
Consequently, a stable Br2 molecule is properly represented by Diagram B
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