CHEMISTRY 171: PROBLEM SET #1 (9/25/09) DUE: Friday, October 2, 2009 1. Give the valence shell configuration for: a) noble gases b) halogens c) chalcogenides d) Fe+2e) Tl f) Lu+3g) Se-2 2. The following are several electronic configurations that may be correct for the nitrogen atom (Z= 7). Arrows represent electrons whose direction indicates the value of the spin quantum number ms. The three circles for the porbitals indicate the possible values of the orbital-orientation quantum number ml. For each configuration write one of the following words: “excited” if the configuration represents a possible excited state of the nitrogen atom; “ground” if the configuration represents the ground state of the nitrogen atom; or “forbidden” if the configuration in question cannot exist. 3. Write the orbital electronic structures for the following atoms and ions and, where appropriate, show that you know Hund’s rule: P(Z= 15); Na(Z= 11); As(Z= 33); C-(Z= 6); O+(Z= 8). 4. Determine the number of unpaired electrons in the following atoms: C(
This is the end of the preview.
access the rest of the document.
nitrogen atom, 1. Give the valence shell configuration