Question

What are the electron pair and molecular geometries of the following molecules?

a. H₂O

b. PCl₃

c. PCl₅

Answer 1

a. H2O
central atom is Oxygen :It is bonded with two H atoms .Hence
O atom has 2 bonded pairs and two lone pairs. So the molecule is
AX2E2 type
Hence electron geometry = Tetrahedral
Molecular geometry =Bent

b. PCl3
central atom is phosphorus :It is bonded with three Cl atoms .Hence
P atom has 3 bonded pairs and 1 lone pairs. So the molecule is
AX3E1 type
Hence electron geometry = Tetrahedral
Molecular geometry = Triagonal pyramidal

c. PCl5
central atom is phosphorus :It is bonded with five Cl atoms .Hence
P atom has 5 bonded pairs and no lone pairs. So the molecule is
AX5 type
Hence electron geometry = trigonal bipyramid
Molecular geometry = trigonal bipyramid

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