Draw the following in sequential steps as one diagram:

(1) Si4+, as central cation, coordinated (bonded) to 4 O2- anions.

(2) Show one O2- anion of the Si tetrahedron (no need to draw perfect geometric arrangements) coordinated to 3 Mg2+ cations (we can assume each Mg has CN= 6 O2- anions, but no need to draw these coordinated anions).

(A) Is the shared O2- anion, coordinated to Si and 3 Mg cations, balanced in charge (i.e., do the cation charges balance the -2 charge on this coordinated O2- anion)? Use Paulings concept of bond strength to establish your answer and show how the four cations bonded with their shared O2- anion balance its -2 charge.