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VSEPR. Valence Shell Electron Pair Repulsion Theory www.longview.k12.wa.us/ralong/tietjen/Chemistry/VSEPR.JAT.ppt. TEKS.

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Vsepr

VSEPR

Valence Shell Electron Pair Repulsion Theory

www.longview.k12.wa.us/ralong/tietjen/Chemistry/VSEPR.JAT.ppt


Vsepr

TEKS

  • 7 (E) predict molecular structure for molecules with linear, trigonal planar, or tetrahedral electron pair geometries using Valence Shell Electron Pair Repulsion (VSEPR) theory.


Vocabulary

Vocabulary:

“lone pair” = “non-bonding pair” = “unshared pair”

= any electron pair that is not involved in bonding

“domain”

= any electron pair, or any double or triple bond is considered one domain.

“bonding pair” = “shared pair”

= any electron pair that is involved in bonding


2 domains on central atom

2 domains on central atom

LINEAR

  • 2 domains

  • both are bonding pairs

  • They push each other to opposite sides of center (180 apart).

BeCl2


3 domains on central atom

3 domains on central atom

TRIGONAL PLANAR

  • 3 domains

  • all are bonding pairs

  • They push each other apart equally at 120 degrees.

GaF3


4 domains on central atom

4 domains on central atom

TETRAHEDRAL

  • 4 domains

  • Each repels the other equally - 109.5 - not the expected 90.

  • Think in 3D.

CH4


Steps for using vsepr

Steps for using VSEPR:

  • Draw a Lewis Dot Structure.

  • Predict the geometry around the central atom.

  • Predict the molecular shape.

… also, we can try and predict the angles between atoms.


All e pairs push each other as far apart as possible

All e- pairs push each other as far apart as possible.

  • Shared (bonding) pairs are “stretched” between two atoms that want them.

    • “Longer & Thinner”

  • Unshared (non-bonding) pairs are not “stretched.”

    • “Shorter & Thicker”


Electron pair repulsion

Electron Pair Repulsion

  • 2 lone pairs require the most space & repel each other the most, resulting in the greatest distance (angle).

  • 1 lone pair (thick) & 1 bonding pair (thin) require less space

  • 2 bonding pairs (both thin) require the least space & repel each other the smallest distance (angle).


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