The molecular orbital diagram of HF looks different than most other diatomic species because the electronegativity difference between H and F is so large. The 1s atomic orbital of H interacts with just one of the 2p atomic orbitals of F to form a bonding o molecular orbital and an antibonding o molecular orbital. This leaves the 2s orbital and two of the 2p orbitals of F as nonbonding orbitals Construct the molecular orbital diagram for HF Molecular orbitals of HF Atomic orbitals of H Atomic orbitals of F Answer Bank 11 1 1s L 1 1L nonbonding 2p NOTE: The 1s orbital for F is not shown in this problem. nonbonding 2s Identify the bond order O 0 0.5 1 O 1.5 O 2 O 2.5 )3 O 3.5 O 4

Which molecular orbitals are formed when the 1s orbitals of two hydrogen atoms combine to form a hydrogen molecule? O two bonding molecular orbitals O only one bonding molecular orbital O one bonding molecular orbital and one antibonding molecular orbital O two antibonding molecular orbitals O only one antibonding orbital

a) Identify atomic orbital #1 and #2. Indicate the number of radial and angular nodes for both b) What type of molecular orbital (σ, π, or no interaction) will be formed when these orbitals approach each other along the x axis? Describe the orbital overlap if applicable. Assume that the atomic orbitals are at appropriate energy levels to mix.

Draw the Lewis structure of CH₃CCH and then choose the appropriate set of hybridization states for the three central atoms. Your answer choice is independent of the orientation of your drawn structure.