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Hands-On Experiment to Verify Consistency from Bulk Density to Atomic and Ionic Radii with Lumps of Metals and Ionic Compounds
- Hands-On Experiment to Verify Consistency from Bulk Density to Atomic and Ionic Radii with Lumps of Metals and Ionic Compounds
- Kim, Seong Kyun; Paik, Seoung-Hey
- DGIST Authors
- Kim, Seong Kyun
- Issue Date
- Journal of Chemical Education, 96(10), 2271-2278
- Article Type
- Author Keywords
- First-Year Undergraduate/General; High School/Introductory Chemistry; Laboratory Instruction; Hands-On Learning/Manipulatives; Solids; Misconceptions/Discrepant Events; Atomic Properties/Structure; Ionic Bonding; Metals; Physical Properties; Solid State Chemistry
- EASILY CONSTRUCTED MODEL; SOLID-STATE; COORDINATION POLYHEDRON; CRYSTAL-STRUCTURES; UNIT CELLS; STUDENTS; CHEMISTRY; CONCEPTIONS; REPRESENTS; WINDOW
- A hands-on experiment to obtain atomic and ionic radii with lumps of metal and ionic compounds is reported here. The experiment is performed with industrial-grade typical metals (iron, copper, aluminum, and lead) and single-crystal lumps of ionic compounds (sodium chloride, potassium chloride, and potassium bromide). Students measure the dimension of the given lumps with Vernier calipers and weigh them with a precision balance. After measuring the dimension and mass of the given lumps, students can calculate the atomic and ionic radius of each corresponding atom and ion with the obtained density values and information about the lattice structures. The obtained values of the metal atomic radii and the ionic radii of the ionic compounds are very close to the values in the literature. After this activity, the students came to appreciate that atomic radii, as typical submicroscopic and symbolic representations, are actually existing features and not an abstract concept. The experiment reported here is suitable for a first-year undergraduate general chemistry class as well as an introductory class at the high school level. © 2019 American Chemical Society and Division of Chemical Education, Inc.
- American Chemical Society
- Related Researcher
Kim, Seong Kyun
Sustainable Chemistry Laboratory
Homogeneous Catalysis for organic reactions& polymerizations; High Performance Polymer Synthesis; Organic-Inorganic Hybrid Frameworks
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