What is the electron pair geometry of the following?

Krafted k: What is the electron pair geometry of the following?

What is the electron pair geometry of the following?
PCl5
SeO2
ClF5

Answer choices: Linear, Trigonal Planar, Tetrahedral, Trigonal Bipyramidal, and Octahedral

P.S. COULD SOMEONE PLEASE LINK A WEBSITE TO HELP ME WITH THIS TOPIC or PERHAPS EXPLAIN IT CLEARLY. I would greatly appreciate much help!

Answers and Views:

Answer by Dr. Buzz
Krafted,

Here is a pretty good reference (see below).

As to your examples:

PCl5: trigonal bipyramidal;
SeO2: trigonal planar (with the lone pair on Se taking up one of the positions on the triangle);
ClF5: octahedral (it looks square pyramidal — see link below — note this is not one of your choices! The lone pair on Cl takes up one of the apices of the octahedron).

Hope that helped!