Chemistry Lewis and VSEPR Structures

Linear (Molecular Shape)

2 Electron Groups, 0 lone pairs, 2 bonding pairs, 180 degrees

Trigonal Planar (Molecular Shape)

3 electron groups, 0 lone pairs, 3 bonding pairs, 120 degrees

Bent (Trigonal Planar Molecular Shape)

3 electron groups, 1 lone pair, 2 bonding pairs, 120 degrees

Tetrahedral (Molecular Shape)

4 electron groups, 0 lone pairs, 4 bonding pairs, 109.5 degrees

Trigonal Pyramidal (Molecular Shape)

4 electron groups, 1 lone pair, 3 bonding pairs, 109.5 degrees

Bent (Tetrahedral Molecular Shape)

4 electron groups, 2 lone pairs, 2 bonding pairs, 109.5 degrees

Trigonal Bipyramidal

5 electron groups, 0 lone pairs, 5 bonding pairs, 90, 120, 180 degrees

Seesaw

5 electron groups, 1 lone pair, 4 bonding pairs, 90, 120, 180

T-shaped

5 electron groups, 2 lone pairs, 3 bonding pairs, 90 and 180 degrees

Linear (Trigonal Bipyramidal Molecular Shape)

5 electron groups, 3 lone pairs, 2 bonding pairs, 180 degrees

Octahedral

6 electron groups, 0 lone pairs, 6 bonding pairs, 90 and 180 degrees

Square Pyramidal

6 electron groups, 1 lone pair, 5 bonding pairs, 90 and 180 degrees

Square Planar

6 electron groups, 2 lone pairs, 4 bonding pairs, 90 and 180 degrees

Which Electronic Structure has 2 electron groups?

Linear

Which Electronic Structure has 3 electron groups?

Trigonal Planar

Which Electronic Structure has 4 electron groups?

Tetrehedral

Which Electronic Structure has 5 electron groups?

Trigonal Bipyramidal

Which Electronic Structure has 6 electron groups?

Octahedral

When are Real Bond Angles less than the Idealized Bond Angles?

When there are lone pairs.

When are Real Bond Angles the same as Idealized Bond Angles?

When the Molecular Shape is a Square Planar, Linear, Trigonal Planar, Tetrahedral, Trigonal Bipyramidal, or Octahedral

How to find Bond Order?

Number of Bonding Pairs (divide by) Number of Bonding Positions

When drawing Resonance structures what symbol do you use?

←→

Is this gaining or losing electrons? 2+

Losing.

Is this gaining or losing electrons? 2-

Gaining.

If you are gaining or losing electrons where do you indicate that in the Lewis Structure?

Make a box in the top right and put the charge.

What is the Octet rule?

Surrounding a main group atom with 8 valence electrons

What are the exceptions of the Octet Rule?

Oxygen (2), Boron (6), and Berylium (4).

Which row of elements can hold more than 8 valence electrons?

Row 3 and lower. This is because of the d-subshell elements.