Valence Shell Electron Pair Repulsion (VSEPR) Theory

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13 Terms

1
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What is the real life 3D shape of molecules based on?

how many pairs of electrons are bonded and nonbonded on the central atom

2
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Linear

(description of shape, BP, LP, Angle)

All atoms are in a straight line

  • 2 or 4 bonded pairs

  • 0 lone pairs

  • Angle: 180

3
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Trigonal Planar

(description of shape, BP, LP, Angle)

Atoms are in the same plane (flat) and make a triangle shape

  • 3 bonded pairs

  • 0 lone pairs

  • Angle: 120

4
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Tetrahedral

(description of shape, BP, LP, Angle)

Three atoms toward the bottom spread out like the legs of a tripod

  • 4 bonded pairs

  • 0 lone pairs

  • Angle: 109.5

5
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Triagonal Pyramidal

(description of shape, BP, LP, Angle)

The three attatched atoms make a triangle base of a pyramid with the central atom on top

  • 3 bonded pairs

  • 1 lone pair

  • Angle: 107

6
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Bent

(description of shape, BP, LP, Angle)

The three attatched atoms make a wide 7 or L shape

  • 2 bonded pairs

  • 2 lone pairs

  • Angle: 104.5

7
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Triagonal Bipyramidal

(description of shape, BP, LP, Angle)

The equatorial atoms make a flat triangle. The axial atoms go up and down

  • 5 bonded pairs

  • 0 lone pairs

  • Angle:

    • E = 120

    • A = 90

8
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Octahedral

(description of shape, BP, LP, Angle)

The equatorial atoms make a flat square. The axial atoms go up and down

  • 6 bonded pairs

  • 0 lone pairs

  • Angle:

    • E = 90

    • A = 90

9
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Square Pyramid

(description of shape, BP, LP, Angle)

Equatorial atoms make a flat square which is the base of the pyramid. Axial atom is the top

  • 5 bonded pairs

  • 1 lone pair

  • Angle:

    • E = 90

    • A = 90

10
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Square Planar

(description of shape, BP, LP, Angle)

The equatorial atoms make a flat square, The lone pairs are axial (straight up and down)

  • 4 bonded pairs

  • 2 lone pairs

  • Angle: 90

11
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T Shape

(description of shape, BP, LP, Angle)

All atoms make a T shape (flat)

  • 3 bonded pairs

  • 2 lone pairs

  • Angle:

    • E = 185

    • A = 87.5

12
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See Saw

(description of shape, BP, LP, Angle)

If this molecule rested on a surface, the lower atoms would be the base. The outer atoms could see saw their motion.

  • 4 bonded pairs

  • 1 lone pair

  • Angle:

    • E = 154.5

    • A = 101.6

13
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Lone pairs take up _____ space than a bonded pair

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