Can someone please solve this and tell me how they did it?

What diagram shows the ionic compound of magnesium oxide

The missing component to the table to the right or indicated with orange letters complete the table by filling in the corresponding numbers or symbols

16. in a reaction that has reached equilibrium, a. the forward and reverse reactions are occurring at the same rate. b. the reactants and products are in equal concentrations. c. the forward reaction has gone further than the reverse reaction. d. there are equal numbers of atoms on both sides of the equation. e. a, b, and d are correct.