Question

Element A has 2 electrons in its M shell. Element B has atomic number 7.

1. Write equations to show how A and B form ions.
2. If B is a diatomic gas, write the equation for the direct combination of A and B to form a compound.
3. If the compound formed between A and B is melted and an electric current is passed through the molten compound, the element A will be obtained at the ______ and B at the ______ of the electrolytic cell.

Answer 1

1. \[\ce{A - 2e- -> A^2+}\] (cation)
   \[\ce{B + 3e- -> B^3-}\] (anion)
2. \[\ce{3A + B2 -> A3B2}\]
3. If the compound formed between A and B is melted and an electric current is passed through the molten compound, then element A will be obtained at the cathode and B at the anode of the electrolytic cell.