Chapter8

lytle da and schock mr us environmental protection

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Unformatted text preview: or decreases without clear correlations with pH, DIC, and temperature, may be caused at least in part by effects of ORP changes.” --Lytle, D.A. and Schock, M.R., U.S. Environmental Protection Agency, 2005 ORP = oxidation-reduction potential DIC = dissolved inorganic carbon Chem 6A Michael J. Sailor, UC San Diego 45 Periodic Trends Main Points: Quantum numbers summary Electron configurations for d-block elements: – First-in, first-out for transition metals: ns electrons removed before (n-1)d electrons – Magnetic properties of transition metal ions: paramagnetism, diamagnetism Chem 6A Michael J. Sailor, UC San Diego 46 Measurement of Magnetic Fig 8.19 Properties No unpaired electrons in compound Compound has unpaired electrons Chem 6A Michael J. Sailor, UC San Diego 47 Problem: Predicting Diamagnetism or Paramagnetism from Electron Configurations 2+ Possible electron configurations for the paramagnetic ion Fe are given below. Which is correct? (a) (b) (c) (d) (e) None of the above are correct Chem 6A Michael J. Sailor, UC San Diego 48 Solution: Predicting Diamagnetism or Paramagnetism from Electron Configurations Electron configuration for Fe: 4s23d6 Electron configuration for Fe2+: 3d6 Always remove (n+1)s electrons before nd electrons when you make ions. How to place electrons in the d orbital? Follow Hund’s rule: Chem 6A Michael J. Sailor, UC San Diego 49 Solution: Predicting Diamagnetism or Paramagnetism from Electron Configurations So (c) is the correct answer: Fe2+ How many unpaired electrons in Fe2+? 4 Chem 6A Michael J. Sailor, UC San Diego 50...
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