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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

Title
Hands-On Experiment to Verify Consistency from Bulk Density to Atomic and Ionic Radii with Lumps of Metals and Ionic Compounds
Authors
Kim, Seong KyunPaik, Seoung-Hey
DGIST Authors
Kim, Seong Kyun
Issue Date
2019-10
Citation
Journal of Chemical Education, 96(10), 2271-2278
Type
Article
Article Type
Article
Author Keywords
First-Year Undergraduate/GeneralHigh School/Introductory ChemistryLaboratory InstructionHands-On Learning/ManipulativesSolidsMisconceptions/Discrepant EventsAtomic Properties/StructureIonic BondingMetalsPhysical PropertiesSolid State Chemistry
Keywords
EASILY CONSTRUCTED MODELSOLID-STATECOORDINATION POLYHEDRONCRYSTAL-STRUCTURESUNIT CELLSSTUDENTSCHEMISTRYCONCEPTIONSREPRESENTSWINDOW
ISSN
0021-9584
Abstract
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.
URI
http://hdl.handle.net/20.500.11750/10959
DOI
10.1021/acs.jchemed.8b00963
Publisher
American Chemical Society
Related Researcher
  • Author Kim, Seong Kyun Sustainable Chemistry Laboratory
  • Research Interests Homogeneous Catalysis for organic reactions& polymerizations; High Performance Polymer Synthesis; Organic-Inorganic Hybrid Frameworks
Files:
There are no files associated with this item.
Collection:
Department of Emerging Materials ScienceETC1. Journal Articles


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