5.3 Molecular Orbital (MO) Model

Question 0

How many e-‘s can a molecular orbital hold?

Answer 0

2, with opposite spins.

Question 1

What is the molecular orbital model?

Answer 1

A model used to describe bonding that does NOT assume e-‘s are localized and rather e-‘s are paired in molecular orbitals much like in atomic orbitals.

Question 2

What is a sigma MO?

Answer 2

The e- probability is centered along an imaginary line that passes through the 2 nuclei.

Question 3

Where is the e- probability for a sigma bonding mo?

Answer 3

Between the 2 nuclei

Question 4

Where is the e- probability for a sigma antibonding mo?

Answer 4

On either side of the nuclei

Question 5

What Orbitals are available to e- in MO model?

Answer 5

Only molecular orbitals, the original atomic orbitals of the individual atoms no longer exist.

Question 6

A bonding MO is ______ in E than the atomic orbitals it is made of.

Answer 6

Lower

Question 7

Which MO is higher in E than the atomic orbitals it is composed of?

Answer 7

Antibonding

Question 8

Which type of MO will have e-‘s that favor separate atoms? Which will have e-‘s that favor bonding?

Answer 8

Anti bonding

Bonding

Question 9

What is bond order?

Answer 9

BO = (# of bonding e-‘s - # of antibonding e-‘s)/2

Question 10

What is bond order and indication of?

Answer 10

BO indicates bond strength since it reflects the number of bonding vs antibonding e-‘s

Question 11

Larger BO means

Answer 11

Greater bond strength

Question 12

What does a BO of 0 mean?

Answer 12

The atoms are more stable separately than together.