Al has a charge of +3 and Br has a charge of -1.
Any compound should have a overall charge of zero.
And you know that 3-3=0, and in that sense you need 3 "-1"s.
Hence you need 3 Br to balance the +3 charge in Al.
Hope it helps
Any compound should have a overall charge of zero.
And you know that 3-3=0, and in that sense you need 3 "-1"s.
Hence you need 3 Br to balance the +3 charge in Al.
Hope it helps
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