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Int. J. Mol. Sci. 2003, 4(6), 379-407; doi:10.3390/i4060379
Article

Theoretical Calculation of Absolute Radii of Atoms and Ions. Part 2. The Ionic Radii

*  and
Received: 9 May 2003; Accepted: 12 May 2003 / Published: 31 May 2003
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Abstract: The theoretical method of determination of absolute atomic size, discussed in Int. J. Mol. Sci. 2002, 3, 87-113, is exploited to calculate absolute radii of the ions whose experimental radii are published by Shanon. The computed radii are found to reproduce the expected periodic variation of size in periods and in groups and nicely reproduce the d-block and f-block contractions in the respective series. It is pointed out that experimental radii of d and f block transition metal ions make erroneous and misleading representation of the size behaviour of the respective series. A detailed comparative study of the crystal radii vis-à-vis the theoretical radii is reported. A rationale of the double hump curve of the experimental radii of 3 d-block transition metal ions is put forward in terms of the crystal field theory and Jahn-Teller distortion. The theoretical radii are exploited to calculate the diamagnetic susceptibility, polarizability and chemical hardness of the ions and compared with available experimental data. The fact of good agreement between the experimental and computed global hardness of ions and correct demonstration of d-block and f-block contraction by the computed radii are used as benchmark to test the validity of the values of the computed theoretical radii of the ions as their representative sizes. It is concluded that the theoretically computed radii of ions are visualizable size representation of ions and can be used as their absolute radii at the respective oxidation states.
Keywords: Crystal radii; Absolute radii; Chemical hardness; Polarizability Crystal radii; Absolute radii; Chemical hardness; Polarizability
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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MDPI and ACS Style

Ghosh, D.C.; Biswas, R. Theoretical Calculation of Absolute Radii of Atoms and Ions. Part 2. The Ionic Radii. Int. J. Mol. Sci. 2003, 4, 379-407.

AMA Style

Ghosh DC, Biswas R. Theoretical Calculation of Absolute Radii of Atoms and Ions. Part 2. The Ionic Radii. International Journal of Molecular Sciences. 2003; 4(6):379-407.

Chicago/Turabian Style

Ghosh, Dulal C.; Biswas, Raka. 2003. "Theoretical Calculation of Absolute Radii of Atoms and Ions. Part 2. The Ionic Radii." Int. J. Mol. Sci. 4, no. 6: 379-407.


Int. J. Mol. Sci. EISSN 1422-0067 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert