Molecular Geometry (VSEPR)

Question 1

VSEPR

Answer 1

The model that describes the molecular geometry of compounds and polyatomic ions is called VSEPR, short for Valence Shell Electron Pair Repulsion. According to this model, the repulsion of electron pairs (bonding pairs and lone pairs) around the central atom of a structure determines the geometry of the structure.

Question 2

sigma bond

Answer 2

The first covalent bond formed between two atoms is called a sigma (σ) bond.

Question 3

Pi bond

Answer 3

Any additional bond between the same two atoms is called a pi (π) bond. Triple bond has 2 Pi bonds and one Sigma bond.

Question 4

why do you only consider sigma bonds not pi bonds when doing stuff?

Answer 4

The electrons of sigma and pi bonds in a double or triple bond do not repel each other since they are attracted by the same two nuclei. Therefore, when in the VSEPR model we make reference to electron pair repulsion, we consider only the lone pairs and sigma bonds.

Question 5

Structural Pairs

Answer 5

The electron pairs around the central atom that repel each other, and therefore determine the structure of the molecule or polyatomic ion, are called structural pairs. Only lone pairs and sigma bonds are structural pairs.

Question 6

Electron pair geometry

Answer 6

includes lone pairs and bonds

Question 7

Molecular geometry

Answer 7

includes bonds, not lone pairs

Question 8

VSEPR Model

Answer 8

Shows cheese wedge when going in front, wifi signal when going out back and lines for on the same plane. Basically the funky arrow stuff.

Question 9

Linear

Answer 9

linear

• 2 sigma bonds
• 2 bonds and 3 lone pairs

Question 10

Trigonal Planar

Answer 10

3 bonds

Question 11

bent:

Answer 11

• 2 bonds and 1 lone pair

- 2 bonds and 2 lone pairs

Question 12

tetrahedral

Answer 12

• 4 bonds

Question 13

trigonal pyramidal

Answer 13

• 3 bonds, 1 lone pair

Question 14

trigonal bipyramidal

Answer 14

• 5 bonds

Question 15

seesaw

Answer 15

• 4 bonds, 1 lone pair

Question 16

t-shaped

Answer 16

• 3 bonds, 2 lone pairs

Question 17

note on electron affinity:

Answer 17

if it is positive, that means that energy is needed to add an electron to the neutral atom so it is unstable.

Question 18

isotope notation

Answer 18

mass number/ atomic number “X”

the big guy over the small kid

Question 19

period

Answer 19

long horizontal guy

Question 20

group

Answer 20

downward kid