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QUESTION

# Do all of the following molecules contain at least one bond angle at 120 degrees: SeS3, SeS2, PCl5, TeCl4, ICI3, and XeCl2?

No, because two of the molecules have no bond angles at 120 °.

To answer this question, you must draw the Lewis structures of the compounds and determine their VSEPR shapes.

"SeS"_3

The Lewis structure of "SeS"_3 is

(from www.homeworklib.com)

This is an "AX"_3 molecule, and its geometry is trigonal planar.

All bond angles in a trigonal planar molecule are approximately 120 °.

"SeS"_2

The Lewis structure of "SeS"_2 is

:stackrel(". .")("S")=stackrel(". .")("Se")=stackrel(". .")("S"):

This is an "AX"_2"E" molecule.

Its electron geometry is trigonal planar.

The bond angle in an "AX"_2"E" molecule is approximately 120 °.

"PCl"_5

The Lewis structure of "PCl"_5 is

This is an "AX"_5 molecule, and its geometry is trigonal pyramidal.

The equatorial bond angles in a trigonal bipyramidal molecule are all 120 °.

"TeCl"_4

The Lewis structure of "TeCl"_4 is

This is an "AX"_4"E" molecule.

Its electron geometry is trigonal pyramidal.

The equatorial bond angle between the equatorial "Te-Cl" bonds is approximately 120 °.

"ICl"_3

The Lewis structure of "ICl"_3 is

This is an "AX"_3"E"_2 molecule.

Its electron geometry is trigonal pyramidal, and its molecular geometry is T-shaped.

The "I-Cl" bond angles in a T-shaped molecule are both approximately 90 °.

"XeCl"_2

The Lewis structure of "XeCl"_2 is

This is an "AX"_2"E"_3 molecule.

Its electron geometry is trigonal pyramidal, with the lone pairs in the equatorial positions.

The molecule is linear, with a "Cl-Xe-Cl" bond angle of 180 °.