Molecular Geometry & VSEPR Theory - Basic Introduction

This chemistry video tutorial provides a basic introduction into molecular geometry and vsepr theory. Examples and practice problems include the trigonomal bypiramidal structure, octahedral molecular structure, seesaw, t-shape, square planar, and square pyramidal molecular geometry as well as some of the bond angles of these structures.
How To Draw Lewis Structures:
• How To Draw Lewis Stru...
VSEPR Theory:
• VSEPR Theory - Basic I...
Molecular Geometry:
• Molecular Geometry & V...
Lewis Dot Structures:
• Lewis Dot Structures -...
Lewis Structures of Ionic Compounds:
• How To Draw The Lewis ...
_________________________________
Octet Rule Exceptions:
• Exceptions To The Octe...
Resonance Structures:
• Resonance Structures, ...
Polar and Nonpolar Molecules:
• Polar and Nonpolar Mol...
Formal Charge Calculations:
• How To Calculate The F...
Lewis Structures - Mega Review:
• Lewis Structures, Intr...
________________________________
Hybridization of Atomic Orbitals:
• Hybridization of Atomi...
Molecular Orbital Theory:
• Molecular Orbital Theo...
Dipole Dipole Forces of Attraction:
• Dipole Dipole Forces o...
Hydrogen Bonding:
• Hydrogen Bonds In Wate...
Unit Cell Chemistry:
• Unit Cell Chemistry ...
_________________________________
Final Exams and Video Playlists:
www.video-tutor.net/
Full-Length Videos and Worksheets:
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[@TheOrganicChemistryTutor]

Final Exams and Video Playlists: www.video-tutor.net/
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Chemistry PDF Worksheets: www.video-tutor.net/chemistry-basic-introduction.html

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[@mehmedv3865]

IF3
7 ve + 3(7) ve = 28 ve
unless if Hydrogen, the atom has to be octet. So, 8 ve x 3 = 24 ve (near 28 ve)
Remaining 4 ve is in the central atom (which is Iodine in this case)

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1:20 Trigonal Bipyrimidal bond angles. 90, and 120

[@youtubec8563]

3:00 Seesaw

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How do you list molecular geometry when there are two central atoms? Will there be two different EG/MG at that point?

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[@azureus8363]

hi there. sorry what is the bond angles for the seesaw, T- shape, square plannar and square pyramidal ?

[@susa9786]

The bond angles in those shapes would be approximately what they are in the geometrical configuration they come from. Square planar bond angles would be 90 degrees. See saw would have two angles that are approximately 90 degrees and one angle of about 120 degrees between the equitorial atoms. Similarly, the angles in the t shape would be about 90 degrees. However, in the see saw and t shape, repulsion from the lone pair would lessen the angles a little.
Source:Google

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How do differentiate between the T shaped one and the trigonal pyramidal? They both have lone pairs or Im not comprehending correctly?

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By the angles between each bond.

[@Laibakhan1524]

Trigonal pyramidal includes only 1lone pair on the central atom whereas in the Tshape there’s 2lone pairs on the central atom

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What is the bond angle of see saw ?

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[@sarak.]

5:54 doesn’t this leave Iodine with 7 electrons.? Two lone pair and 3 shared?

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Thank you for the video! I have one question, I'm having trouble understanding the hybridization of the I in IF5
Can someone help me, please?

[@susa9786]

sp3d2

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Just circle the bonds around the Center atom, if the lone pair is connected count that too.

[@aldricbenalan4755]

Has a steric number of 5; 1 lone pair and 4 single bonds with Fluorine. Thus, hybridiziation of the Iodine is sp3d2.

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how do I determine which molecular geometry I must use?

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By using the type of Hybridisation formed . sp,sp2,sp3,sp3d,sp3d2 and etc. Each type has a different shape like Linear, Trigonal bipyramid, Square planar, Tetrahedreal, Octahedral. Use Google to see that.

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Ax5: Trigonal Bipyramidal
Ax4e1: Seesaw
Ax3e2: T-Shaped
Ax6: Octahedral
Ax5e1 : Square
Ax4e2 : Square planar

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5:44 doesnt the iodine break the octet rule? I see 10 valence electrons there, when i thought it should be 8. Can you explain?

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Sometimes, it can be broken if it minimizes formal charge

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How do yk the angles of the molecule

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How do first molecule P has 10 electrons

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Nick T it can expand its octet

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how did you know that each Fluorine is gonna have 8 electrons?

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Because fluorine has 7 electrons, and it needs 8 according to the octet rule.

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What are those dots mean?

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electrons

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Don’t understand and See saw… it looks nothing like one.

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It sort of does. Think of the two central angles atoms being the middle base of the seesaw, with the linear backbone ends being the "seats"

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