Question

The valency of an element A is 3 and that of element B is 2. Write the formula of the compound formed by the combination A and B.
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Answer 1

Answer:

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A2B3

2A3+ + 3B2- ------> A2B3. This means that 2 atoms of A reacts with 3 atoms of B. 

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Answer 2

Explanation:

B have valency 2 =Beryllium

A have valency 3=Boron

therefore

B +Be--->B2e