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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?
Relativistic Effects and the Chemistry of the Heaviest Main-Group ElementsJohn S. Thayer The heaviest main-group elements often show markedly different chemical properties than their lighter counterparts. Most of these differences arise from changes in the relative energies of the outer-shell atomic orbitals that can be explained by application of Einstein's theory of special relativity to electrons in atoms. Thayer, John S. J. Chem. Educ.2005, 82, 1721.
Main-Group Elements |
Atomic Properties / Structure |
Metals |
Organometallics |
Periodicity / Periodic Table
Effects of Exchange Energy and Spin-Orbit Coupling on Bond EnergiesDerek W. Smith It is shown that the ground states of atoms having pn configurations are stabilized by exchange energy (n = 2, 3, or 4) and/or spinorbit coupling (n = 1, 2, 4, or 5). Smith, Derek W. J. Chem. Educ.2004, 81, 886.
The Amount of Substance: MolesEd Vitz, John W. Moore A section of ChemPrime, the Chemical Educations Digital Library's free General Chemistry textbook.
