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QUESTION

# What is the molecular geometry of PBr5? Draw its VSEPR and Lewis structure.

PBr_5's is trigonal bipyramidal.

Let's start with its . P has 5 and Br has 7 , which means that a total of 5 + 5*7 = 40 electrons must be accounted for.

P's bonds with the five Br atoms account for 5 * 2 = 10 electrons, while the three lone pairs on each Br atom complete the rest of the electrons - 5 * 6 =30 electrons.

SInce P forms bonds with 5 other atoms and has no lone pairs, it has a steric number and a coordination number equal to 5 . According to , this corresponds to a trigonal bipyramidal molecular geometry.