CHM 501

Exam 1

September 30, 1999

1. Write the electron configurations for the following (use the rare gas notation for closed shells): a) Sc⁺; b) N^3-; c) Zn²⁺; d) Cu⁺; e) Au³⁺; f) Gd³⁺; g) Ce³⁺.

2. Find all of the Russell-Saunders terms for the s¹d¹ electron configuration. Predict the energetic ordering of the different states.

3. The 6s¹6p¹ electron configuration, as discussed by Mason, gives rise to ³P₀, ³P₁, ³P₂, and ¹P₁ terms. Show that the sum of the degeneracies of each J state is equal to the total number of microstates for the 6s¹6p¹ configuration.

4 On the attached graph paper, plot electron affinity and Z* (calculated using Slater's rules) as a function of atomic number for the atoms from Li to Ne. In general, does Z* account for the variation in electron affinity? Why or why not? Are there any specific anomalies in the trend? If so, give an explanation.