Answer:
The correct answer is option 3 = group 13
Explanation:
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In the periodic table the groups are vertical and the horizontal periods. The elements of group 13 such as Aluminum (Al), Boron and others. These elements have 3 valence electrons. Element X needs to have 3 valence electrons since Br accepts an electron and there are 3 bromine.
The correct answer is option 3 = group 13
