In a compound X, cation W has valency 2 and an anion M has 3. What will be the formula of the compound X?

W₃M₂

Explanation:

A compound must be neutral, that means the change of the compound must be equal to 0.

The compund of the problem is WₐMₓ

If A is the positive charge and B the negative charge. :

A + B = 0; A = B (1)

The charge of A is written as:

2*a = A

And the charge of B = A:

3*x = A

If a = 3:

2*3 = A = 6

3*x = 6

x = 2

That means the formula is: