. Commentationes physico-mathematicae. Mathematics; Physics. On the Radii of Ions. 25 c <. Mg(0H)2 according to G. Aminoff. Figure 5. Mg(0H)2 according to J. A. Wasastjerna. Figure 6. Li"^-ion in crystals, let us examine LiF. The observed grating distance is 2,05 A, whilst the ionic radius of fluorine is 1,33 A. The ionic radius of Li"^ has therefore the calculated value 0,72 A. Again taking the case of Lil, we find that the grating interval between Li+ and I"" has the calculated value 2,91 A, a grating interval however which, accord- ing to Landes assumption, cannot be
. Commentationes physico-mathematicae. Mathematics; Physics. On the Radii of Ions. 25 c <. Mg(0H)2 according to G. Aminoff. Figure 5. Mg(0H)2 according to J. A. Wasastjerna. Figure 6. Li"^-ion in crystals, let us examine LiF. The observed grating distance is 2,05 A, whilst the ionic radius of fluorine is 1,33 A. The ionic radius of Li"^ has therefore the calculated value 0,72 A. Again taking the case of Lil, we find that the grating interval between Li+ and I"" has the calculated value 2,91 A, a grating interval however which, accord- ing to Landes assumption, cannot be realised, as the iodine ions were already touching each other. Figures 3—4 illustrate the above simple calculation. Vegard (Vidensk. selsk. skrifter. Mat. naturv. kl. 1921, N:o 6, Kristiania) and Aminoff (Geol. Foren. Forhandl. Bd. 43. H. 5. 1921. Stockholm) have pointed out that the radius of the hydrogen atom in crystals is relatively great, or about 0,8—1,1 A. With the help of W. L. Braggs ionic radii for Mg^"^ and 0 Aminoff thus gets for H"^ in Mg(0H)2 the value 1,15 A. That the hydrogen nucleus should have such an effective radius, is a 'priori incredible. In reahty the importance of the radius of H"^ seems to vanish entirely, when this compound is examined with the help of the ionic radii of Mg++ and 0 givenin this Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Finska vetenskaps-societeten, Helsinki. Helsingfors
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