Question 1

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

Accepted Answer

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

Question 2

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

Accepted Answer

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

Question 3

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

Accepted Answer

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

Question 4

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

Accepted Answer

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

Question 5

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?

Accepted Answer

A) 
 
B) 
 
C) 
 
D)  
 
E)  A, B, and D

Question 6

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

Accepted Answer

A)  
 
B) 
 
C) 
 
D)  
 
E)  B and C
F) None of the above

Question 7

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

Accepted Answer

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

Question 8

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

Accepted Answer

A)  S2-, Cl-, Ar, K+, Ca2+ 
B)  Ca2+, K+, Ar, Cl-, S2- 
C)  Ca2+, S2-, K+, Cl-, Ar 
D)  Ar, K+, Cl-, Ca2+, S2- 
E)  Ar, Cl-, K+, S2-, Ca2+

Question 9

The molecule HeH+ has an antibonding MO of the form

For this you would expect

Accepted Answer

A)  C1 > C2 
B)  C2 2 
C)  C1 = C2

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

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

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

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

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

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?

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

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

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

The molecule HeH⁺ has an antibonding MO of the form For this you would expect