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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.
Electronegativity and the Bond TriangleTerry L. Meek and Leah D. Garner The dependence of bond type on two parameters, electronegativity difference (??) and average electronegativity (?av), is examined. It is demonstrated that ionic character is governed by the partial charges of the bonded atoms, and metallic character by the HOMOLUMO band gap. Meek, Terry L.; Garner, Leah D. J. Chem. Educ.2005, 82, 325.
Atomic Properties / Structure |
Covalent Bonding |
Metallic Bonding |
Ionic Bonding |
Main-Group 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.
Atomic Properties / Structure |
Computational Chemistry |
Molecular Modeling |
Molecular Properties / Structure
Electronegativity and atomic chargeReed, James L. Because electronegativity is such a fundamental concept, it should be continually developed in sophistication throughout the curriculum; considers the energy function, atomic charges, and chemical reactivities. Reed, James L. J. Chem. Educ.1992, 69, 785.
The Amount of Substance: MolesEd Vitz, John W. Moore A section of ChemPrime, the Chemical Educations Digital Library's free General Chemistry textbook.
