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2. Ionic radius - Wikipedia

   en.wikipedia.org/wiki/Ionic_radius

   Ionic radius, r ion, is the radius of a monatomic ion in an ionic crystal structure. Although neither atoms nor ions have sharp boundaries, they are treated as if they were hard spheres with radii such that the sum of ionic radii of the cation and anion gives the distance between the ions in a crystal lattice .

3. Pauling's rules - Wikipedia

   en.wikipedia.org/wiki/Pauling's_rules

   For typical ionic solids, the cations are smaller than the anions, and each cation is surrounded by coordinated anions which form a polyhedron.The sum of the ionic radii determines the cation-anion distance, while the cation-anion radius ratio + / (or /) determines the coordination number (C.N.) of the cation, as well as the shape of the coordinated polyhedron of anions.

4. Fajans' rules - Wikipedia

   en.wikipedia.org/wiki/Fajans'_rules

   The "size" of the charge in an ionic bond depends on the number of electrons transferred. An aluminum atom, for example, with a +3 charge has a relatively large positive charge. That positive charge then exerts an attractive force on the electron cloud of the other ion, which has accepted the electrons from the aluminum (or other) positive ion.

5. Compatibility (geochemistry) - Wikipedia

   en.wikipedia.org/wiki/Compatibility_(geochemistry)

   Compatibility of an ion is controlled by two things: its valence and its ionic radius. [1] Both must approximate those of the major element for the trace element to be compatible in the mineral. For instance, olivine (an abundant mineral in the upper mantle) has the chemical formula (Mg,Fe) 2 SiO 4.

6. Cation-anion radius ratio - Wikipedia

   en.wikipedia.org/wiki/Cation-anion_radius_ratio

   In condensed matter physics and inorganic chemistry, the cation-anion radius ratio can be used to predict the crystal structure of an ionic compound based on the relative size of its atoms. It is defined as the ratio of the ionic radius of the positively charged cation to the ionic radius of the negatively charged anion in a cation-anion ...

7. Kapustinskii equation - Wikipedia

   en.wikipedia.org/wiki/Kapustinskii_equation

   Kapustinskii replaced r 0, the measured distance between ions, with the sum of the corresponding ionic radii. In addition, the Born exponent, n , was assumed to have a mean value of 9. Finally, Kapustinskii noted that the Madelung constant , M , was approximately 0.88 times the number of ions in the empirical formula. [ 2 ]

8. Atomic radius - Wikipedia

   en.wikipedia.org/wiki/Atomic_radius

   Ionic radius: the nominal radius of the ions of an element in a specific ionization state, deduced from the spacing of atomic nuclei in crystalline salts that include that ion. In principle, the spacing between two adjacent oppositely charged ions (the length of the ionic bond between them) should equal the sum of their ionic radii.

9. Ionic potential - Wikipedia

   en.wikipedia.org/wiki/Ionic_potential

   Ionic potential is the ratio of the electrical charge (z) to the radius (r) of an ion. [1]= = As such, this ratio is a measure of the charge density at the surface of the ion; usually the denser the charge, the stronger the bond formed by the ion with ions of opposite charge.