6.13 Electron Configurations and the Aufbau Principle
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Paramagnetism: Compounds Vials of a number of compounds (NaCl, MnSO4, FeSO4, CoCl2, NiSO4, ZnSO4, K4Fe(CN)6, [Co(NH3)6]Cl3, [Ni(NH3)6]Cl2, and H2O) are hung from a thread. When a magnet is brought near, some of the vials are attracted.
Magnetic Properties |
Atomic Properties / Structure
Paramagnetism: Oxidation States of Manganese Manganese(III) oxide, with 4 unpaired electrons per Mn atom, is more strongly attracted to a magnet than is manganese(IV) oxide, with only 3 unpaired electrons per Mn atom. Potassium permanganate, a compound of Mn(VII), has no unpaired electrons and is not attracted to a magnet.
An incomplete concept map is shown below, which set of terms for A, B, C and D would result in a correct map based on the concept of wave mechanics applied to a hydrogen atom?
News from the Periodic Table: An Introduction to "Periodicity Symbols, Tables, and Models for Higher-Order Valency and Donor–Acceptor Kinships"Henry A. Bent and Frank Weinhold Proposes that alternative display topologies such as a 2D "left-step" or "step-pyramid" table or 3D "periodic towers" can supplement or supplant the standard periodic table by better emphasizing higher-order patterns of chemical association and reactivity, rather than the physical resemblances of standard-state elemental substances. Bent, Henry A.; Weinhold, Frank. J. Chem. Educ.2007, 84, 1145.
Atomic Properties / Structure |
Periodicity / Periodic Table |
Spectroscopy
Trends in Ionization Energy of Transition-Metal ElementsPaul S. Matsumoto Examines why, as the number of protons increase along a row in the periodic table, the first ionization energies of the transition-metal elements are relatively steady, but that for the main-group elements increases. Matsumoto, Paul S. J. Chem. Educ.2005, 82, 1660.
Atomic Properties / Structure |
Periodicity / Periodic Table |
Transition Elements
A Program of Computational Chemistry Exercises for the First-Semester General Chemistry CourseScott E. Feller, Richard F. Dallinger, and Paul Caylor McKinney A series of 13 molecular modeling exercises designed for the first-semester general chemistry course is described. The modeling exercises, which are used as both prelecture explorations and postlecture problems, increase in difficulty and in student independence. Feller, Scott E.; Dallinger, Richard F.; McKinney, Paul Caylor. J. Chem. Educ.2004, 81, 283.
The Amount of Substance: MolesEd Vitz, John W. Moore A section of ChemPrime, the Chemical Educations Digital Library's free General Chemistry textbook.
