Chemistry 401

Intermediate Inorganic Chemistry

University of Rhode Island

Exam 1

September 30, 2013

1. Write the electron configuration (using rare gas notation for closed shells) and the ground state Term Symbol for the following: a) Sc; b) Sc+; c) Sc2+; d) Sc3+; e) Sc.

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2. Write the Lewis dot structure, give the formal charges on all atoms, predict the molecular geometry, estimate of all bond angles, and give the likely hybrid orbital for the following: a) BrO2; b) BrO3; c) BrO2F3.

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3. The Absolute Hardness of an atom is defined as η = ½(IP – EA), IP is the ionization potential and EA is the electron affinity. Predict the periodic trends of η and provide reasoning for your prediction.

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4. Cr2 has an electron configuration of σ2π4δ4δ*2. What is the bond order and how many unpaired spins are predicted? Would you expect Cr2 to absorb light in the visible region of the spectrum? Why or why not?

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