2.7. How Are Electron Configuration and Position in the Periodic Table Related?, 56
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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.
Lanthanum (La) and Actinium (Ac) Should Remain in the d-blockLaurence Lavelle This paper discusses the reasons and implications of placing lanthanum and actinium in the f-block and lutetium and lawrencium in the d-block. Lavelle, Laurence. J. Chem. Educ.2008, 85, 1482.
Are Some Elements More Equal Than Others?Ronald L. Rich Presents a new periodic chart with 18 columns but no interruptions of atomic numbers at Lanthanum or Actinum, and no de-emphasis of elements 57-71 or 89-103 by seeming to make footnotes of them. It shows some elements more than once in order to illuminate multiple relationships in chemical behavior. Rich, Ronald L. J. Chem. Educ.2005, 82, 1761.
Interactive Electron ConfigurationsWilliam F. Coleman An application that allows students to drag electrons onto energy levels to construct electron configurations for atoms up to atomic number Ar. The student is responsible for obeying the fundamental rules of quantum mechanics.
Atomic Properties / Structure |
Periodicity / Periodic Table |
Enrichment / Review Materials
Electron ConfigurationsEd Vitz, John W. Moore A section of ChemPrime, the Chemical Educations Digital Library's free General Chemistry textbook.
