The figure that follows shows ball-and-stick drawings of three possible shapes of an AF3 molecule. (a) For

Question:

The figure that follows shows ball-and-stick drawings of three possible shapes of an AF3 molecule.
(a) For each shape, give the electron-domain geometry on which the molecular geometry is based.
(b) For each shape, how many nonbonding electron domains are there on atom A?
(c) Which of the following elements will lead to an AF3 molecule with the shape in (ii): Li, B, N, Al, P, Cl?
(d) Name an element A that is expected to lead to the AF3 structure shown in (iii). Explain your reasoning.