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Isotopes: Heavy Water Ice Cubes An H2O ice cube is shown to float in a beaker of liquid water, while an ice cube of D2O (heavy water) is shown to sink in liquid water.
Hydrogen Bonding |
Isotopes |
Physical Properties |
Atomic Properties / Structure |
Water / Water Chemistry
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.
Atoms,_Molecules_and_Ions : CalcAtmWeight (10 Variations)
Chlorine has two naturally occurring isotopes, 35Cl and 37Cl, with masses of 34.9689 amu and 36.9659 amu, respectively. Calculate the abundances of these isotopes of chlorine.
Forecasting Periodic Trends: A Semester-Long Team Exercise for Nonscience MajorsJohn Tierney Teams of students in a course for nonscience majors identify trends among the properties of elements in the periodic table, use Excel to plot and produce best-fit equations to describe relationships among those properties, and apply the resulting formulas to predict and justify the properties of missing elements. Tierney, John. J. Chem. Educ.2008, 85, 1215.
Atomic Properties / Structure |
Computational Chemistry |
Main-Group Elements |
Nonmetals |
Periodicity / Periodic Table |
Metals |
Student-Centered Learning
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.
