Chemistry 401

Intermediate Inorganic Chemistry

University of Rhode Island

Fall 2011

Exam 1

1. Find the electron configuration and ground state term symbol for a) Na^–; b) Mg²⁺; c) Co³⁺; d) La⁺; e) Cu²⁺. Use the rare gas notation for closed shells.

2. Write the Lewis dot structure showing the formal charges, predict the structure including an estimate of all bond angles, and indicate the likely hybrid orbital on the central atom for the following: a) XeO₃; b) PO₃^3–; c) KrF₂.

3. In the first row diatomic molecules, B₂ and C₂ are anomalous because B₂ has 2 unpaired spins and C₂ has no unpaired spins, 2 pi bonds and no sigma bonds. Explain these observations.

4. Plot the electron affinities for the first row atoms (Li to Ne). Explain the general trend and any deviations from the general trend.

 

 

Answers