Bond Lengths and Atomic Radii in Compounds EX3 (E = N, P, As, Sb; X = F, Cl, Br, I).

Correlations between bond lengths d and the first ionization potentials of atoms and molecules are established on the basis of experimental data. Functional dependences are obtained for the series of compounds EX₃ (E = N, P, As, Sb; X = F, Cl, Br, I) when Х or E are substituted. The difference between dependences with varied E or Х are explained by the differing effects on electron pairs of ion E³⁻. A way of estimating the values of ion radii R_E for the elements N, P, As, and Sb is proposed. Interdependences of the values of radii of ions, their dipole moments, and refractions are discussed. The effect substituents X have on the values of radii R_E is shown. The values of radii R_E(3−) are evaluated for spherically symmetric ions. Linear dependences of radii R_E(3−) and ionization potentials of the corresponding ions E³⁻ and atoms of inert gases on their effective charges are established. [ABSTRACT FROM AUTHOR]