Question

Compound made 3+ And 3-

Answer 1

Try a different combination. 
A^3+ and B^1-, to get a 3- charge you need 3xB^1-, so the formula is AB3. 

or 
A^3+ and C^2-, you have to get to 6+ and 6-, meaning you need 2xA and 3XC, or A2C3.