Br3– has a –1 charge, which means it gained an electron. The total number of valence electrons present in the molecule is:
Group Valence Electrons
Br 7A 3 × 7 e– = 21 e–
From –1 charge: + 1 e–
Total: 22 valence e–
Draw Lewis structures of Br3–, I3– and F3–.
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