An element A has valency +3 while another element B has valency -2. Give the formula of their compound formed when A reacts with B
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8
just exchange the valancy numbers
that is, give 3 to B and 2 to A
we'll get A2B3
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3
A2B3 would be the compound formed.
We get this upon criss- crossing the valencies of both the elements A and B
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