Hat do all of the molecules in the table have in common? What trend do you observe that distinguishes lone pairs from bonding domains?

Use the simulation to build a system with 5 domains. This is called a trigonal bipyramidal structure. The two different sites in a trigonal bipyramid are labeled as A and B in the drawing to the right.

Each A atom is adjacent to 3 B atoms. What is the A-­‐C-­‐B bond angle?

Each B atom is adjacent to 2 A atoms and 2 B atoms. What is the B-­‐C-­‐B bond angle.

In a system with 4 atoms and 1 lone pair, predict whether the lone pair will be in a B site or an A site? Explain.