Question

Q1) The valency of an element A is 3 and element B is 2. Write the formula of the compound forned by combination of A andB?

Answer 1

`A_2B_3`

Explanation:

You may know that when you combine two atoms, such as `O` and `Fe` you interchange them valencies. `O` is 2, and `Fe` has lots of valecies, but we are going to take `3`, as an example.

So it would be `Fe_2O_3`

You just have to do the same with elements `A` and `B`.
`A` is 3, `B` is 2; so:

`A_2B_3`