1. Stamps of Greatness

2. If the density of gold is 1
If the density of gold is 1.9 × 104 kg/m3, what is the volume occupied by one atom?

3. What is the wavelength of a photon with an energy of 4.07 × 10-19 J?

4. Suppose that the binding energy for an electron in a metal atom is 3
Suppose that the binding energy for an electron in a metal atom is 3.9 × J. What frequency of light has the minimum energy required to eject an electron from this metal?

5. Calculate the wavelength of the n = 5 to n = 2 transition of a hydrogen atom.

6. Calculate the kinetic energy of an electron with a wavelength of 110 nm.

7. Which of the following sets of quantum numbers is considered valid for a 5d electron?
n, l, ml, ms
A. 5, 1, -1, +1/2
B. 5, 2, +2, -1/2
C. 5, 3, 0, +1/2
D. 5, 4, +3, -1/2
E. 5, 5, 0, +1/2

8. Determine the number of planar and spherical nodes in a 4d orbital

9. Rank the following atoms in order of increasing ionization energy: Sc, O, He, and Fr.
A. O < He < Fr < Sc
B. He < O < Sc < Fr
C. Fr < Sc < O < He
D. Sc < He < Fr < O
E. Fr < He < O < Sc

10. Write 4 other species that are isoelectronic with argon.

11. Write the electronic configuration of Cu+ and Cu2+ and indicate whether they are paramagnetic or diamagnetic.

12. Order the following bonds from least polar to most polar: MgS, CO, HF, NO
A. CO < NO < HF < MgS
B. NO < CO < MgS < HF
C. MgS < CO < NO < HF
D. HF < MgS < CO < NO
E. HF < CO< NO < MgS

13. Using appropriate Lewis structures explain why both the nitrogen to oxygen bonds in nitromethane (CH3NO2), an important solvent and race car fuel, are identical. You may assume that the molecule is not cyclic.

14. Consider HNCO and HOCN.
Write a Lewis structure for each formula.
(b) Are these two species the same or different?
(c) Compare the anions produced when each of the two species loses a proton (H+). Are they the same or different?

15. Describe the shapes of ammonium ion (NH4+) and ammonia (NH3)
Describe the shapes of ammonium ion (NH4+) and ammonia (NH3). Which of these two species is likely to have the wider HNH angle?

16. Predict the shape of the following species.
SeF4
BrF5

17. What are the values for the different types of bond angles in the following geometries?
Tetrahedral
Octahedral
Trigonal Bipyramidal