Question

18.

A. What is the electron-pair geometry for Br in BrF4-?

There are lone pair(s) around the central atom, so the molecular geometry (shape) of BrF4- is _________.

B. What is the electron-pair geometry for P in PCl5?

There are lone pair(s) around the central atom, so the molecular geometry (shape) of PCl5 is _________.

Answer 1

1)

Br has 7 valence electrons. Due to -1 charge, it has 8 valence electrons.

4 are used to form 4 bonds and there remaining 4 electrons are present as 2 lone pairs.

Central atom has 2 lone pair and 4 bond pair

So, there are 6 electron domain around central atom

So, the electron geometry is Octahedral

Central atom has 2 lone pair and 4 bond pair

So, the shape is Square Planar

Answer:

Electron pair geometry: Octahedral

Molecular geometry: Square Planar

2)

P has 5 valence electrons. All 5 are used in forming 5 bonds.

There are no lone pair on P

Central atom has 0 lone pair and 5 bond pair

So, there are 5 electron domain around central atom

So, the electron geometry is Trigonal Bipyramidal

Central atom has 0 lone pair and 5 bond pair

So, the shape is Trigonal Bipyramidal

Answer:

Electron pair geometry: Trigonal Bipyramidal

Molecular geometry: Trigonal Bipyramidal