Size of Atoms - Purdue University
http://chemed.chem.purdue.edu/genchem/topicreview/bp/ch7/size.html
The Size of Atoms: Ionic Radii . The relative size of atoms can also be studied by measuring the radii of their ions. The first ionic radii were obtained by studying the structure of LiI, which contains a relatively small positive ion and a relatively large negative ion. The analysis of the structure of LiI was based on the following assumptions.
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