Deck 4: Quantum Mechanics, Atomic Structure, Quantum Mechanics and Molecular Structure

Question 1

A MO orbital for a heteronuclear diatomic is given by
If A is more electronegative than B then you would predict that

A) C_A > C_B
B) C_A = C_B
C) C_A < C_B
D) C_A = -C_B
E) you would not expect any relation between these coefficients and the electronegativity of the elements A & B

Answer 1

C_A > C_B

Question 2

The molecule HeH⁺ has an antibonding MO of the form

For this you would expect

A) C₁ > C₂
B) C₂ < C₂
C) C₁ = C₂

Answer 2

C₁ > C₂

Question 3

Oxygen is paramagnetic and has a bond order of two. Which of the following represents the ground electronic state for oxygen?

A)

B)

C)

D) A and C are equally probable
E) None of the above

Answer 3

Question 4

Which of the following combinations of atomic orbitals will result in a bonding molecular orbital for a homonuclear diatomic molecule when the z-axis is aligned with the nuclei of the bonded atom?

A)

B)

C)

D)

E) A, B, and D

Question 5

Given that Z_eff(2s) in Li is 1.26, estimate the energy of the 2s electron in Li in Rhydberg units.

A) -0.40
B) -0.63
C) -0.79
D) -1.26
E) -4.0

Question 6

Rank from smallest to largest in terms of atom/ionic radii.

A) S^2-, Cl^-, Ar, K⁺, Ca²⁺
B) Ca²⁺, K⁺, Ar, Cl^-, S^2-
C) Ca²⁺, S^2-, K⁺, Cl^-, Ar
D) Ar, K⁺, Cl^-, Ca²⁺, S^2-
E) Ar, Cl^-, K⁺, S^2-, Ca²⁺

Question 7

What do you predict of the electron configuration of element 117?

A) [Rn]7s²5f¹⁴6d¹⁰7p⁵
B) [Rn]7s²6d¹⁰7p⁶
C) [Rn]7s¹5f¹⁴6d¹⁰7p⁶
D) [Rn]7s²7f¹⁴7d¹⁰7p⁵
E) [Rn]7s²4f¹⁴3d¹⁰7p⁵

Question 8

The wavefunction for the 2s orbital in hydrogen is given by At what radius is there a node?

A) r = 0
B) r = 2/a₀
C) r = a₀
D) r = 2a₀
E) there are no radial nodes in this function

Question 9

Of the following angular components for the wave functions of one-electron atoms, which one(s) must correspond only to s type orbitals?

A)

B)

C)

D)

E) B and C
F) None of the above