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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?
The "Dissing" of Niels BohrAndrew R. Peterson Contributions made by Bohr to the Periodic Law. Peterson, Andrew R. J. Chem. Educ.2004, 81, 33.
Molecular Modeling |
Quantum Chemistry |
Atomic Properties / Structure |
Periodicity / Periodic Table
The KLM-Shell LabelsWilliam B. Jensen In response to a reader's inquiry, this column traces the origins of the K, L, M labels for the shells of the Bohr atom. Jensen, William B. J. Chem. Educ.2003, 80, 996.
Atomic Properties / Structure
The Place of Zinc, Cadmium, and Mercury in the Periodic TableWilliam B. Jensen Explanation for why the zinc group belongs with the main group elements; includes several versions of periodic tables. Jensen, William B. J. Chem. Educ.2003, 80, 952.
The Amount of Substance: MolesEd Vitz, John W. Moore A section of ChemPrime, the Chemical Educations Digital Library's free General Chemistry textbook.
