The method to determine the distance between the center of mass for the molecule and the atom with the large distance. Further, the ionic radius of the atom excluding hydrogen atoms. The summision of both are the effective ionic radius of molecule.
Mr. Khalaf,
You can use HyperChem to obtain such information.
Dear., Prof. Bojidarka Ivanova
Excuse me, My major is physics. Unfournatly, I don't know hyperChem. DO you mind to share it with me
@bojidarka B. Ivanova
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