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For more information, please see full course syllabus of Chemistry
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Lecture Comments (10)

0 answers

Post by sania sarwar on April 22, 2014

how do we draw a molecular shape of graphite?

0 answers

Post by Asim Ali on March 2, 2014

Thank you sir its an honour learning from such a knowledgabe person. CHeck this out.

1 answer

Last reply by: Zachary McCoy
Sat Jan 4, 2014 8:18 PM

Post by alesha mills on November 21, 2013

I don't understand how he choosing the sp orbitals. 2s +3p gives me four orbitals. Please explain, clearly!

0 answers

Post by Maimouna Louche on July 2, 2012

To Miguel, you only count the sets for central atoms. The lone pairs on O don't count.

2 answers

Last reply by: sania sarwar
Tue Apr 22, 2014 9:49 PM

Post by Miguel Suarez on May 17, 2012

if you say that every bond is count as a set even lone pairs in the previous examples,like co2 and the other ones you did not count the lone pairs. and the example of water as tetra you do count the lone pairs. why?

1 answer

Last reply by: Zachary McCoy
Sat Jan 4, 2014 8:06 PM

Post by Sarah Diab on January 8, 2012

What would the VSEPR notation of the central atom in H2CO be?

Related Articles:

Shapes of Molecules and Hybridization

  • VSEPR goes from Lewis structure to molecular shape

  • An electron set is any kind of bond or a lone pair

  • 2 sets: linear; example FBeF

  • 3 sets: trigonal planar; examples BF3 H2CO

  • 4 sets: tetrahedral; examples CH4 NH3 H2O

  • 5 sets: trigonal bipyramid; example PF5

  • 6 sets: octahedral; example SF6

  • Hybridizing atomic orbitals to fit observed – and VSEPR – shapes

  • sp: linear; sp2: trigonal planar; sp3 : tetrahedral

  • Overlapping s orbitals gives sigma M.O.

  • Overlapping p orbitals gives pi M.O.

Shapes of Molecules and Hybridization

Lecture Slides are screen-captured images of important points in the lecture. Students can download and print out these lecture slide images to do practice problems as well as take notes while watching the lecture.

  • Intro 0:00
  • VSEPR: Valence Shell Electron Pair Repulsion 0:53
  • Counting Electron Sets 4:20
    • Example: Methane
    • Example: Ammonia
    • Example: Formaldehyde
    • Example: Hydrogen Cyanide
  • Geometry of 2 and 3 Sets 10:28
    • Two Sets: Linear
    • Examples
    • Three Sets: Trigonal and Planar
    • Examples
  • Geometry of 4 Sets 19:46
    • Four Sets: Tetrahedral
    • Examples
  • Geometry of 5 and 6 Sets 27:50
    • Five Sets: Trigonal Bipyramid
    • Six Sets: Octahedron
  • Hybridization and Hybrid Orbitals 32:07
    • Linus Pauling
    • Example: Carbon
  • Orbital Phases 40:14
    • Wave Function Phases
    • Example: 2p Orbital
  • Sigma Bonds 42:51
    • Example: Ethane
  • Pi Bonds 49:04
    • Example: Ethylene
  • Additional Example 1
  • Additional Example 2